In this series
RESONEO ·
Between ranking and display, twiddlers, small programs, rework the list of results: they boost one result, demote another, filter out a third or space out those from the same site. In 2018, an internal Google document counted more than 65 of them in production for web search alone. We found 120 twiddlers across web, images and video, among them E-E-A-T expertise, topic authority, a filter named after Bard and the plan of searches to run for a question, the basis of AI Mode’s fan-out.
Google’s ranking scores hundreds of results. Before display, Superroot, the system that sends the query to Google’s indexes and then assembles their answers, runs that list through the twiddlers. Each one recommends a change (move up, move down, filter, space out) and the twiddler framework reconciles these recommendations. The twiddlers’ names say along which lines a position still moves at this stage: AI, quality, spam and copyright, freshness, user preferences.
Six twiddlers belong to Google’s AI and rankers. None appears in the 2024 leak. In the second pass, models rework the list, a full ranker scores the results again and a filter bears the name of Google’s conversational AI.
The query fan-out Google describes for AI Mode (May 2025) starts from a plan: the searches to run for a question. That plan travels with the query into the second pass and sits among its ranking signals. The twiddlers know the searches planned for the question when they rework the list.
In the schemas
Planned Retrieval AnnotationsPlannedRetrievalAnnotationsplanned retrieval annotationsThe sources of AI Overviews and AI Mode, part 4 of the series
Bard became Gemini in February 2024; the filter keeps its name. Its settings arrive with the query and it leaves a trace on each result it examines: Google’s conversational AI has its own filter in Search’s second pass.
In the schemas
Bard Filter Twiddler ParamsBardFilterTwiddlerParamsfilter settings, sent with the queryBard Filter Twiddler DataBardFilterTwiddlerDatafilter data on each resultIn machine learning, an oracle is the model that gives the reference answer. Its inputs, for the query and for each result, sit among the ranking signals, and it scores each result: after ranking, a reference model measures relevance a second time.
In the schemas
Relevance Oracle Twiddler Result SignalsRelevanceOracleTwiddlerResultSignalsthe oracle’s score on each resultRelevance Oracle Twiddler Query Input SignalsRelevanceOracleTwiddlerQueryInputSignalsinputs taken from the queryRankBrain, launched in 2015, is Google Search’s first deep learning system (Google, February 2022). Part of what it produces goes through a twiddler and is applied in Superroot, which sends the query to Google’s indexes and assembles their answers, on an already scored list.
In the schemas
RankBrain Query FeaturesRankBrainQueryFeaturesquery featuresRankBrain Twiddler Result SignalsRankBrainTwiddlerResultSignalstwiddler signals on each resultThe For Loop Ranker (FLR), with its web-specific settings, scores the results in turn: a full-fledged ranker runs as a twiddler, next to simpler adjustments.
In the schemas
FLR Output Result SignalsFLROutputResultSignalsFor Loop Ranker scores on each resultQuery Param SignalsQueryParamSignalsweb-specific settingsRelevance feedback is a classic information retrieval technique: results are scored again by how much they resemble results judged good, often the top ones in the list. Google gives it a twiddler for web search, one for images, built on Starburst, Google’s image embedding already cited in the 2024 leak, and a third for video.
In the schemas
Relevance Feedback Result SignalsRelevanceFeedbackResultSignalssignals on each web resultStarburst Local Relevance Feedback Twiddler Ranklab SignalsStarburstLocalRelevanceFeedbackTwiddlerRanklabSignalsthe image variant, with StarburstGoogle talks about E-E-A-T and topic authority in its guidelines and on its blogs. Each of these notions has a twiddler: they weigh in the score, then can still move a page after it.
Expertise, one of the four criteria of E-E-A-T in the quality rater guidelines, has its twiddler, with features computed for each document. Expertise is therefore judged page by page.
In the schemas
Expertise Twiddler Doc FeaturesExpertiseTwiddlerDocFeaturesexpertise features of each documentExpertise Twiddler ParamsExpertiseTwiddlerParamstwiddler settingsAuthenticity is measured for the query and for each result. An approximate version of Ascorer, the main ranker, also computes an authenticity boost: the notion counts during ranking, then after it.
In the schemas
Authenticity Twiddler Query Level SignalsAuthenticityTwiddlerQueryLevelSignalsquery-level signalsAuthenticity Twiddler Result Level SignalsAuthenticityTwiddlerResultLevelSignalsresult-level signalsGoogle described its topic authority for news in May 2023: a local outlet rises for the news events it covers in its city, a specialist outlet for its field (health, politics, finance). The twiddler has features for the query and for each document: a site’s authority is measured on the topic of the query. Another twiddler attaches authority data to each result.
In the schemas
Topic Authority Twiddler Doc FeaturesTopicAuthorityTwiddlerDocFeaturesfeatures of each documentTopic Authority Twiddler Query FeaturesTopicAuthorityTwiddlerQueryFeaturesquery featuresWeb health signals come with each result. At Google, web health also covers citation-based originality, which gives weight to the outlet others cite for a piece of news.
In the schemas
Web Health Twiddler Result SignalsWebHealthTwiddlerResultSignalsweb health signals on each resultThe same family also includes a “hero” document, the domain classification already named in the leak, and two twiddlers known by code names, Natural Pearls and Starbow.
Each of these 120 twiddlers reached production after experiments and a launch review: at Google, every proposed change goes before “our most experienced engineers and data scientists”, who decide whether it launches (How Search works). Once launched, a twiddler is there to last.
Expertise Twiddler Doc FeaturesExpertiseTwiddlerDocFeatures Expertise Twiddler ParamsExpertiseTwiddlerParams
Authenticity Twiddler Query Level SignalsAuthenticityTwiddlerQueryLevelSignals Authenticity Twiddler Result Level SignalsAuthenticityTwiddlerResultLevelSignals
Topic Authority Twiddler Doc FeaturesTopicAuthorityTwiddlerDocFeatures Topic Authority Twiddler Query FeaturesTopicAuthorityTwiddlerQueryFeatures Topic Authority Twiddler ParamsTopicAuthorityTwiddlerParams
Authority DataAuthorityData
Web Health Twiddler Result SignalsWebHealthTwiddlerResultSignals
Natural Pearls Twiddler Query SignalsNaturalPearlsTwiddlerQuerySignals Natural Pearls Twiddler Result SignalsNaturalPearlsTwiddlerResultSignals
Hero Doc DataHeroDocData
In web design, the hero is the large block featured at the top of a page; the visual digest SERP layout has its own “hero” block too.
Domain ClassificationDomainClassification
It follows each result and the whole result set. The leak already named it (qualityTwiddlerDomainClassification).
Starbow Query SignalsStarbowQuerySignals Starbow Result SignalsStarbowResultSignals
RankBrain Query FeaturesRankBrainQueryFeatures RankBrain Twiddler Result SignalsRankBrainTwiddlerResultSignals RankBrain Twiddler Result AnnotationRankBrainTwiddlerResultAnnotation
Relevance Oracle Twiddler ParamsRelevanceOracleTwiddlerParams Relevance Oracle Twiddler Result SignalsRelevanceOracleTwiddlerResultSignals Relevance Oracle Twiddler Query Input SignalsRelevanceOracleTwiddlerQueryInputSignals Relevance Oracle Twiddler Result Input SignalsRelevanceOracleTwiddlerResultInputSignals
Planned Retrieval AnnotationsPlannedRetrievalAnnotations
Bard Filter Twiddler DataBardFilterTwiddlerData Bard Filter Twiddler ParamsBardFilterTwiddlerParams
FLR Output Query SignalsFLROutputQuerySignals FLR Output Result SignalsFLROutputResultSignals Query Param SignalsQueryParamSignals
Relevance Feedback Result SignalsRelevanceFeedbackResultSignals
Site Boost Spam Query InfoSiteBoostSpamQueryInfo Site Boost Kemtek InfoSiteBoostKemtekInfo
Heavily Spam Demoted ResultsHeavilySpamDemotedResults Demoted ResultDemotedResult
The list of results heavily demoted for spam, kept for the whole page, and a record on each demoted result.
Dmca Site Twiddler SignalsDmcaSiteTwiddlerSignals
Crime Demotion ParamsCrimeDemotionParams Crime Demotion Query SignalsCrimeDemotionQuerySignals Crime Demotion Result SignalsCrimeDemotionResultSignals
Bad URLs AnnotationBadURLsAnnotation
Google checks bad URLs query by query, and this twiddler keeps their annotation.
Doc Filter InfoDocFilterInfo
SafeSearch Twiddler Optt ParamsSafeSearchTwiddlerOpttParams Image Result SignalsImageResultSignals
The SafeSearch twiddler itself, with image signals on each result.
SafeSearch Blur Twiddler Optt ParamsSafeSearchBlurTwiddlerOpttParams
SafeSearch Adaptive Violence Optt ParamsSafeSearchAdaptiveViolenceOpttParams
The handling of violence in SafeSearch, depending on the query.
SafeSearch Edsa Porn Optt ParamsSafeSearchEdsaPornOpttParams
SafeSearch settings for pornography.
Revenge Porn Filter ParamsRevengePornFilterParams Revenge Porn Filters SignalsRevengePornFiltersSignals
Revenge porn is intimate imagery shared without the person’s consent. Google’s ranking systems guide provides for demoting sites that receive a significant volume of removals of such imagery, and Google announced ranking changes against explicit deepfakes in July 2024.
Kid Friendly Search Twiddler ParamsKidFriendlySearchTwiddlerParams
For supervised children’s accounts, which get a restricted search.
Topic Affinity Twiddler Query SignalsTopicAffinityTwiddlerQuerySignals Topic Affinity Twiddler Result SignalsTopicAffinityTwiddlerResultSignals
Freshness Twiddler Doc AnnotationsFreshnessTwiddlerDocAnnotations Freshness Twiddler Query AnnotationsFreshnessTwiddlerQueryAnnotations Freshness Twiddler 2 ParamsFreshnessTwiddler2Params Freshness Twiddler 2 HuVo ParamsFreshnessTwiddler2HuVoParams
Date Score Twiddler ParamsDateScoreTwiddlerParams
Its settings travel with each query.
View Demotion Twiddler ParamsViewDemotionTwiddlerParams
When the user repeats a query, the results they have already seen move down. The Discover feed and the image feed also push back what has already been seen.
Freshest Twiddler AnnotationsFreshestTwiddlerAnnotations Freshest Substrate Twiddler ParamsFreshestSubstrateTwiddlerParams Freshest Substrate Twiddler AnnotationsFreshestSubstrateTwiddlerAnnotations Freshest Substrate Result Twiddler AnnotationFreshestSubstrateResultTwiddlerAnnotation
On a repeated query, the freshest content can move ahead; one variant relies on the stateful layer.
Stateful Substrate Twiddler ParamsStatefulSubstrateTwiddlerParams Stateful Substrate Annotation SignalsStatefulSubstrateAnnotationSignals
A layer that keeps state from one repeated query to the next.
Intent Personalized Boost Twiddler ParamsIntentPersonalizedBoostTwiddlerParams
A boost by the user’s intent, built on the stateful layer.
Recall Boost Annotation SignalsRecallBoostAnnotationSignals
Tied to repeat queries; its signals travel with each result.
Revisitable Results AnnotationRevisitableResultsAnnotation
The results a user comes back to, on repeated queries.
Sirius Suggest Annotations Twiddler ParamsSiriusSuggestAnnotationsTwiddlerParams Sirius Suggest Annotations SignalsSiriusSuggestAnnotationsSignals
Sirius, one of the sources of a query’s interpretations, provides suggestions here for repeat queries.
P13n Rank Domain Preference Twiddler ParamsP13nRankDomainPreferenceTwiddlerParams P13n Rank Domain Preference Twiddler Result AnnotationP13nRankDomainPreferenceTwiddlerResultAnnotation
Pref Twiddler ParamsPrefTwiddlerParams
The user’s preferences.
For You Result SignalsForYouResultSignals
Ulp Query SignalsUlpQuerySignals Ulp Result SignalsUlpResultSignals
Optionalization Filter Twiddler Query AnnotationsOptionalizationFilterTwiddlerQueryAnnotations Optionalization Exported SignalsOptionalizationExportedSignals
Optionalization is the rewriting step that makes some words of the query optional. This filter annotates the query and exports its signals.
Post Results Qref Twiddler ParamsPostResultsQrefTwiddlerParams
QRef, the annotation of the query’s entities, run again after the results.
Host Path Twiddler ParamsHostPathTwiddlerParams
Web Cluster AnnotationWebClusterAnnotation Potential Cluster AnnotationPotentialClusterAnnotation
Groups of web results, with a cluster annotation and a potential cluster annotation.
Dynamic Srp Twiddler Query SignalsDynamicSrpTwiddlerQuerySignals Dynamic Srp SignalsDynamicSrpSignals
A SERP whose shape changes with the query; its schemas track web results, location, each result’s ranking and similar shopping products.
About This Result Twiddler ParamsAboutThisResultTwiddlerParams
The panel that opens from the icon Google placed next to most results in February 2021 says where the result comes from and describes the site behind it; it has its twiddler.
Forum Twiddler ParamsForumTwiddlerParams
Google added a Discussions and forums block in September 2022. This forum ranking twiddler receives its settings with the query.
Nearby Twiddler Query SignalsNearbyTwiddlerQuerySignals Nearby Twiddler Result SignalsNearbyTwiddlerResultSignals Nearby Twiddler Doc AnnotationsNearbyTwiddlerDocAnnotations
Hashtag Twiddler Result AnnotationHashtagTwiddlerResultAnnotation Hashtag Twiddler Response AnnotationHashtagTwiddlerResponseAnnotation
Hashtag search has its own results, and Discover its trending hashtags.
Hashtag Firehose Twiddler ParamsHashtagFirehoseTwiddlerParams
A firehose is a continuous real-time stream of posts.
Hashtag Repeat Query Twiddler ParamsHashtagRepeatQueryTwiddlerParams
The repeat-query logic, for hashtags.
Social Media Twiddler ParamsSocialMediaTwiddlerParams
Visual digest is a SERP layout, with a hero block and web, image, video, news, fact and social media results; this twiddler handles its social media part.
Multidestination Twiddler ParamsMultidestinationTwiddlerParams
Short travel videos that cover several destinations.
Seek Volume Twiddler ParamsSeekVolumeTwiddlerParams
Specialty Merchants Query SignalsSpecialtyMerchantsQuerySignals Specialty Merchants Result SignalsSpecialtyMerchantsResultSignals
Measured for the query and for each result.
Deals Result SignalsDealsResultSignals Deals Twiddler ParamsDealsTwiddlerParams
In November 2023 Google opened a deals destination in Search that gathers on-sale products from across the web.
Shopping Cluster AnnotationShoppingClusterAnnotation Shopping Cluster Annotator ParamsShoppingClusterAnnotatorParams
It groups shopping results. The 2018 document described annotator twiddlers, which prepare information for the stages that follow.
Shopping Result Tag AnnotationShoppingResultTagAnnotation Shopping Result Tag Annotator ParamsShoppingResultTagAnnotatorParams
Another annotator, which puts tags on shopping results.
Shopping P13n Twiddler Result AnnotationShoppingP13nTwiddlerResultAnnotation P13n Result Annotation For ShoppingP13nResultAnnotationForShopping
A personal adjustment of shopping results.
Spark Twiddler InfoSparkTwiddlerInfo
Scubed is a Superroot backend serving varied verticals (retail, real estate, restaurant dishes, movies and TV, audiobooks) and producing embedding annotations; Spark and UCS are its two twiddlers.
Ucs Twiddler InfoUcsTwiddlerInfo
The other Scubed twiddler; the schemas also name UCS embedding annotations.
UCP Twiddler ParamsUCPTwiddlerParams
Users’ contributions in Search, such as the discussions Google hosts about a match or a series; each contribution stays tied to its author’s account.
Search By Entity Optt ParamsSearchByEntityOpttParams
After a click on an entity, the next SERP lines up around it: the state passed from one search to the next can switch this twiddler off and pushes back results with no link to the chosen entity.
Signal Outliers Twiddler ParamsSignalOutliersTwiddlerParams
DATEFILTER TWIDDLERDATEFILTER_TWIDDLER
Named among the reasons for putting forward a search tools option, with prices, boosts (of the tool, geographic, cross-language), results already visited and the recipe tool. The date score has its own twiddler.
PRICES TWIDDLERPRICES_TWIDDLER
One of the reasons for putting forward a search tools option, like the date filter.
Image Boost Twiddler Doc SignalsImageBoostTwiddlerDocSignals Image Boost Twiddler Query SignalsImageBoostTwiddlerQuerySignals
The leak named WebImageBoostTwiddler, which reads, for the images of web results, the EQ and TQ scores, the image’s emotional and technical quality.
Demographic Diversity Twiddler ParamsDemographicDiversityTwiddlerParams Demographic Diversity Twiddler Query SignalsDemographicDiversityTwiddlerQuerySignals Demographic Diversity Twiddler Result SignalsDemographicDiversityTwiddlerResultSignals
The leak named a Skin Tone Twiddler. In May 2022, Google presented the Monk Skin Tone scale, to show a wider range of skin tones in image results; the image viewer lets users report that a group is over- or under-represented.
Image Aesthetics Twiddler Ranklab Query SignalsImageAestheticsTwiddlerRanklabQuerySignals Image Aesthetics Twiddler Ranklab Result SignalsImageAestheticsTwiddlerRanklabResultSignals
Image Commercial Twiddler Ranklab Query SignalsImageCommercialTwiddlerRanklabQuerySignals Image Commercial Twiddler Ranklab Result SignalsImageCommercialTwiddlerRanklabResultSignals
Image Viewer Commercial Twiddler ParamsImageViewerCommercialTwiddlerParams
The commercial side of the image viewer, the panel that opens on an image.
Image Low Relevance Twiddler ParamsImageLowRelevanceTwiddlerParams
Image Viewer Host Diversity Twiddler ParamsImageViewerHostDiversityTwiddlerParams
The 2018 document describes ImageHostCategorizer, which keeps a single host from placing too many images in the same image block.
Image Inspiration Diversity Twiddler ParamsImageInspirationDiversityTwiddlerParams
Implication Association Twiddler ParamsImplicationAssociationTwiddlerParams Implication Association Triggering InfoImplicationAssociationTriggeringInfo
With its settings and triggering conditions. WebRef, the Google system that recognizes entities in a text, also links entities through an implication.
More Like These Twiddler ParamsMoreLikeTheseTwiddlerParams More Like These Result AnnotationMoreLikeTheseResultAnnotation More Like These Response AnnotationMoreLikeTheseResponseAnnotation
Repeat Query Twiddler ParamsRepeatQueryTwiddlerParams
The repeat-query logic, for image search.
Image Online Guided Chips Creator ParamsImageOnlineGuidedChipsCreatorParams
The refinement buttons above image results.
IU Inappropriate Filter Twiddler ProtoIUInappropriateFilterTwiddlerProto
It removes inappropriate images from the image block of web results (Images Universal). The leak already named this Superroot filter.
Multimodal Twiddler Ranklab Result SignalsMultimodalTwiddlerRanklabResultSignals
It combines several modalities, such as image and text.
Starburst Local Relevance Feedback Twiddler Ranklab SignalsStarburstLocalRelevanceFeedbackTwiddlerRanklabSignals
Starburst is an image embedding, already cited in the 2024 leak: images are scored again by how much they resemble the query’s top results.
Image Shopping P13n Twiddler ParamsImageShoppingP13nTwiddlerParams
A personal adjustment of shopping images.
Image Sensitive Shopping Twiddler ParamsImageSensitiveShoppingTwiddlerParams
Vss Ranklab Twiddler ResultVssRanklabTwiddlerResult
In the leak, VSS is the image understanding stack: logo recognition, OCR, deep tags of shopping images.
Lens Sensitivity Twiddler Ranklab Query SignalsLensSensitivityTwiddlerRanklabQuerySignals Lens Sensitivity Twiddler Ranklab Result SignalsLensSensitivityTwiddlerRanklabResultSignals
Sensitive content in Lens.
Non Exact Match Filter Twiddler ParamsNonExactMatchFilterTwiddlerParams
Toledo Twiddler Query SignalsToledoTwiddlerQuerySignals Toledo Twiddler Result SignalsToledoTwiddlerResultSignals
Youtube Deduplication Twiddler Result AnnotationYoutubeDeduplicationTwiddlerResultAnnotation
The 2018 document described YoutubeDuplicatesRemovalTwiddler, which puts the original upload above its copies.
Youtube Clickbait Twiddler Query AnnotationsYoutubeClickbaitTwiddlerQueryAnnotations
Youtube Shorts Authenticity Twiddler Result AnnotationYoutubeShortsAuthenticityTwiddlerResultAnnotation
Youtube Nonsensical Twiddler Result AnnotationYoutubeNonsensicalTwiddlerResultAnnotation
Youtube Channel Diversity Twiddler Result AnnotationYoutubeChannelDiversityTwiddlerResultAnnotation
Youtube Playback Speed Twiddler Result AnnotationYoutubePlaybackSpeedTwiddlerResultAnnotation
Youtube Seeks Twiddler Result AnnotationYoutubeSeeksTwiddlerResultAnnotation
Viewers’ jumps (seeks) from one point of a video to another.
Video Passages Twiddler ParamsVideoPassagesTwiddlerParams
Video Segment Topicality Twiddler ParamsVideoSegmentTopicalityTwiddlerParams
Topicality measured for each segment of the video.
Creator Affinity Twiddler ParamsCreatorAffinityTwiddlerParams
Brand Affinity Twiddler ParamsBrandAffinityTwiddlerParams
Video Engagingness Twiddler ParamsVideoEngagingnessTwiddlerParams
Video Thumbnail Twiddler ParamsVideoThumbnailTwiddlerParams
Video Aspect Boost Twiddler ParamsVideoAspectBoostTwiddlerParams
A boost by the ratio of image width to height (aspect), vertical or horizontal.
Short Duration Demotion Twiddler ParamsShortDurationDemotionTwiddlerParams
Video Pulsar Relevance Feedback Twiddler ParamsVideoPulsarRelevanceFeedbackTwiddlerParams
The video variant of relevance feedback; the image one bears the name Starburst.
Svu Duplicates Twiddler ParamsSvuDuplicatesTwiddlerParams
Svu Diversity Twiddler ParamsSvuDiversityTwiddlerParams
Local Personalization Twiddler ParamsLocalPersonalizationTwiddlerParams
Youtube Localization Twiddler Query AnnotationYoutubeLocalizationTwiddlerQueryAnnotation
Adaptation to the user’s language and country.
Youtube Playlist Seeking Twiddler Doc AnnotationsYoutubePlaylistSeekingTwiddlerDocAnnotations
QPrime Boost Twiddler Result AnnotationQPrimeBoostTwiddlerResultAnnotation
In the leak, QPrime is a query classifier that assigns shopping categories; this boost depends on it.
Youtube Shopping Twiddler Response AnnotationsYoutubeShoppingTwiddlerResponseAnnotations
Shopping Categorical Refinements Ranking Twiddler Result AnnotationShoppingCategoricalRefinementsRankingTwiddlerResultAnnotation
The ranking of refinements by product category, in video results.
Youtube Shorts Ranking Twiddler Response AnnotationYoutubeShortsRankingTwiddlerResponseAnnotation
Youtube Safety Twiddler Result AnnotationYoutubeSafetyTwiddlerResultAnnotation
Youtube Demographics Twiddler Doc AnnotationsYoutubeDemographicsTwiddlerDocAnnotations Youtube Demographics Twiddler Response AnnotationsYoutubeDemographicsTwiddlerResponseAnnotations
Youtube Rwj Twiddler Result AnnotationYoutubeRwjTwiddlerResultAnnotation
The leak spells RWJ out as Real World Journey, Knowledge Graph data under governance rules; this YouTube twiddler bears the same acronym.
Beehive Signals Twiddler ParamsBeehiveSignalsTwiddlerParams
Aquila Twiddler Result AnnotationAquilaTwiddlerResultAnnotation
CatNorvi Twiddler Result AnnotationCatNorviTwiddlerResultAnnotation
Youtube Shorts Efficiency Twiddler Result AnnotationYoutubeShortsEfficiencyTwiddlerResultAnnotation
A page can come out of ranking in a good spot and move down afterwards. Spam still weighs at this stage: the results page keeps the list of results heavily demoted for spam, and SiteBoost, named in the leak, spots user-generated spam pages and relies on the site’s main category to judge whether a result matches the query.
Copyright targets the whole site. Since August 2012, Google has demoted sites that receive many valid removal notices. In 2018, the DMCAFilter removed the targeted results; today the twiddler works at site level: past a certain volume of notices, the whole domain goes down.
On a crime-related search, pages can move down after ranking: this demotion is measured for the query and for each result. Google’s ranking systems guide describes a related demotion, for sites that charge to remove personal information.
SafeSearch has its twiddler and variants: blurring of explicit images, announced in February 2023, violence according to the query, pornography, revenge porn. Kid-friendly search for children’s accounts has its own twiddler, and another keeps the annotation of bad URLs, which Google checks query by query.
Take a query typed again the next day. A whole family of twiddlers handles it: results already seen move down, the most recent content moves ahead, results the user comes back to are spotted, and a stateful layer remembers from one search to the next. A recall boost is tied to the same repeat queries.
For you carries personal re-ranking, and personalized ranking’s domain preference annotates each result. Topic affinity brings results closer to the topics the user cares about. For news, Google launched Preferred sources in August 2025: users pick the sites they want to see more often in Top Stories.
ULP, the user’s preferred languages in the leak, has signals for the query and for each result. Nearby measures how close each result is to the user: a nearby business can gain places.
The leak’s FreshnessTwiddler reads a page’s dates and the date Google estimates for its content, from the text, the anchors and related pages. It has a second version, and a date score receives its settings with each query. Google describes these “query deserves freshness” systems in its ranking systems guide.
Images have 20 twiddlers. Among them: the image boost and demographic diversity, both named in the leak, aesthetics, commercial images, low-relevance images, guided chips above the results and a filter for inappropriate content. In the leak, the image boost for web results reads an image’s emotional (EQ) and technical (TQ) quality.
Video results have 33 twiddlers. Two of them echo announcements. In December 2024 YouTube announced stronger action against egregious clickbait, starting in India, and in July 2025 it renamed its repetitious content monetization policy “inauthentic content”. Both topics have their twiddler: clickbait, which annotates the query, and the authenticity of each Short. Others judge nonsensical videos, channel diversity, playback speed and viewers’ jumps within a video.
Toledo sorts YouTube results into types: learning, information seeking, entertainment, dubbed videos, audio match.
Expertise, authenticity and topic authority each have their twiddler. Expertise is judged document by document; topic authority is built on a topic and over time.
Past a certain volume of valid notices, the whole site goes down, including its flawless pages.
Freshness twiddlers read a page’s dates and the date Google estimates for its content. A real update, clearly dated, helps a page move ahead of an old comparison.
For you and domain preference apply the user’s habits and choices after ranking. In Top Stories, Preferred sources lets everyone pick their outlets: a site its readers add shows up there more often for them.
Forum ranking, deals and specialty merchants each have their twiddler. On a shopping query, a discussion, a deals page or a product specialist can move ahead of a better-scored page: a brand gains from being present there.
An internal Google document from 2018 describes the mechanism; we presented it in 2024 in Google leak, part 2: understanding the twiddler framework. The framework is part of Superroot, the system that sends the query to Google’s indexes and then assembles their answers. It reworks the results of a single corpus, web, images or videos, once the backend has scored them.
Boostmove a result up or downBoostAboveResultplace a result above anotherfilterremove a resultmax_totalcap the number of results of one kindstridespace out results of the same categoryAnnotatingleave information for later stepsEach twiddler works alone, unaware of the others’ decisions: it recommends, the framework decides. The document also noted that a ranking experiment is easier to run with a twiddler: a few Superroot jobs are enough, where the alternative is building an Ascorer section or bringing up 1,400 jobs. That isolation and that ease explain their number.
RankLab, the system that records Google’s ranking signals, keeps track of every pass: the settings, the response and the results of the twiddlers, with a log and a debug table. Every adjustment can thus be analyzed, query by query.
| Named in 2018 or in the leak | Today |
|---|---|
Image Host CategorizerImageHostCategorizer2018 document | Host diversity in the image viewer |
Official Page TwiddlerOfficialPageTwiddler2018 document: an entity’s official page in position 1 on the query for its name | The same idea travels in the state one search passes on to the next: pin the entity’s “about” part at the top, or stop forcing its knowledge panel into position 1 |
Youtube Duplicates Removal TwiddlerYoutubeDuplicatesRemovalTwiddler2018 document | YouTube deduplication |
DMCA FilterDMCAFilter2018 document | DMCA site, at site level |
Site Boost TwiddlerSiteBoostTwiddlerleak 2024 | SiteBoost |
Freshness TwiddlerFreshnessTwiddlerleak 2024 | Freshness, in a second version, and date score |
Web Image Boost TwiddlerWebImageBoostTwiddlerleak 2024 | Image boost |
Skin Tone Twiddlerleak 2024 | Demographic diversity of images |
quality Twiddler Domain ClassificationqualityTwiddlerDomainClassificationleak 2024 | Domain classification |
The knowledge panel placed in position 1 ties this second pass to the Knowledge Graph: how Google feeds, maintains and grows its Knowledge Graph, part 5 of the series.
The twiddler mechanism also works upstream, on what the query means. KScorer, the Google Search component that scores a query’s interpretations, that is, its possible meanings (jaguar the animal or jaguar the car), runs its scores through twiddlers twice: as soon as the query arrives, then again once results are in, based on the meaning most retrieved pages cover. Among these twiddlers, a freshness boost favors the meaning that is in the news, and a periodicity boost the one that comes back on a fixed date, such as a yearly tournament or Black Friday. The adjusted score, the k-score, is the one that counts from then on. Above 0.60 or 0.65, two signals mark it as good, and other systems take it up, including Google Assistant: a comment from Google’s engineers states that its k-score “comes from twiddled_ranking_scores in query interpretations”. A twiddler can therefore flip the meaning Google settles on, and the whole SERP with it: on the day Jaguar unveils a new model, the car can move ahead of the animal.