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HHI points, CR4 points, and leading-share points across different products and periods are not pooled or ranked.","entityHref":"/markets/us-search-engine-usage","explorerHref":"/trends?markets=us-search-engine-usage&metric=leaderShare","monitorHref":"/economy/monitor?signal=market-leader-share%3Aus-search-engine-usage#competition-monitor-console"},{"dispatchId":"market-change-field","dispatchSlug":"market-structure-change-field","dispatchTitle":"Latest market-structure signals moved in both directions.","dispatchScope":"domain-readout","dispatchDomain":"markets","dispatchUpdatedThrough":"2026-07-21","dispatchHref":"/insights/market-structure-change-field","publicationSeriesNumber":"AR-CI-2026-01","publicationSeriesTitle":"Competition Insights","publicationAuthor":"Antitrust Radar Research Team","publicationDate":"2026-08-12","publicationUpdatedAt":"2026-08-12","publicationVersion":"1.0","publicationStatus":"current","signalId":"market-cr4:us-social-media-referral-traffic","signalDomain":"markets","signalMetricId":"market-cr4","signalMetricLabel":"Four-participant concentration ratio","entityId":"mkt-social-referral","entityCode":"us-social-media-referral-traffic","entityLabel":"Social referrals","unit":"percentage_points","priorPeriod":"2025","priorYear":2025,"priorValue":95.09,"latestPeriod":"2026","latestYear":2026,"latestValue":94.38,"delta":-0.71,"deltaPercent":-0.7,"direction":"decreased","sourceIds":["statcounter-social-referral-us-2026"],"sourcePublishers":["StatCounter Global Stats"],"observation":"Social referrals moved from 95.1% in 2025 to 94.4% in 2026 (-0.71 percentage points).","interpretation":"The latest encoded CR4 anchor is lower within this documented market series. The change alone does not identify a cause or establish competitive harm.","researchQuestion":"Which participant-share changes account for the structural movement, and are the denominator and coverage stable across both anchors?","signalGuardrail":"This is a within-profile comparison governed by the documented statcounter all-platform social-media referral share boundary. It is not annualized and should not be compared as a common national series with differently defined markets.","insightGuardrail":"Competition Insights are editorial summaries of exact, source-custodied Competition Monitor rows. A dispatch may inventory several signals, but it does not average unlike measures, create a composite score, rank research importance, establish a legal market, identify a cause, or prove market power, competitive harm, liability, or enforcement performance. The direction count is an inventory, not a vote about competition. HHI points, CR4 points, and leading-share points across different products and periods are not pooled or ranked.","entityHref":"/markets/us-social-media-referral-traffic","explorerHref":"/trends?markets=us-social-media-referral-traffic&metric=cr4","monitorHref":"/economy/monitor?signal=market-cr4%3Aus-social-media-referral-traffic#competition-monitor-console"},{"dispatchId":"market-change-field","dispatchSlug":"market-structure-change-field","dispatchTitle":"Latest market-structure signals moved in both directions.","dispatchScope":"domain-readout","dispatchDomain":"markets","dispatchUpdatedThrough":"2026-07-21","dispatchHref":"/insights/market-structure-change-field","publicationSeriesNumber":"AR-CI-2026-01","publicationSeriesTitle":"Competition Insights","publicationAuthor":"Antitrust Radar Research Team","publicationDate":"2026-08-12","publicationUpdatedAt":"2026-08-12","publicationVersion":"1.0","publicationStatus":"current","signalId":"market-hhi:us-social-media-referral-traffic","signalDomain":"markets","signalMetricId":"market-hhi","signalMetricLabel":"Herfindahl-Hirschman Index","entityId":"mkt-social-referral","entityCode":"us-social-media-referral-traffic","entityLabel":"Social referrals","unit":"hhi_points","priorPeriod":"2025","priorYear":2025,"priorValue":3804,"latestPeriod":"2026","latestYear":2026,"latestValue":4995,"delta":1191,"deltaPercent":31.3,"direction":"increased","sourceIds":["statcounter-social-referral-us-2026"],"sourcePublishers":["StatCounter Global Stats"],"observation":"Social referrals moved from 3,804 in 2025 to 4,995 in 2026 (+1,191.0 HHI points).","interpretation":"The latest encoded HHI anchor is higher within this documented market series. The change alone does not identify a cause or establish competitive harm.","researchQuestion":"Which entry, exit, share, switching, price, quality, or capacity evidence can explain the movement inside this exact market boundary?","signalGuardrail":"This is a within-profile comparison governed by the documented statcounter all-platform social-media referral share boundary. It is not annualized and should not be compared as a common national series with differently defined markets.","insightGuardrail":"Competition Insights are editorial summaries of exact, source-custodied Competition Monitor rows. A dispatch may inventory several signals, but it does not average unlike measures, create a composite score, rank research importance, establish a legal market, identify a cause, or prove market power, competitive harm, liability, or enforcement performance. The direction count is an inventory, not a vote about competition. HHI points, CR4 points, and leading-share points across different products and periods are not pooled or ranked.","entityHref":"/markets/us-social-media-referral-traffic","explorerHref":"/trends?markets=us-social-media-referral-traffic&metric=hhi","monitorHref":"/economy/monitor?signal=market-hhi%3Aus-social-media-referral-traffic#competition-monitor-console"},{"dispatchId":"market-change-field","dispatchSlug":"market-structure-change-field","dispatchTitle":"Latest market-structure signals moved in both directions.","dispatchScope":"domain-readout","dispatchDomain":"markets","dispatchUpdatedThrough":"2026-07-21","dispatchHref":"/insights/market-structure-change-field","publicationSeriesNumber":"AR-CI-2026-01","publicationSeriesTitle":"Competition Insights","publicationAuthor":"Antitrust Radar Research Team","publicationDate":"2026-08-12","publicationUpdatedAt":"2026-08-12","publicationVersion":"1.0","publicationStatus":"current","signalId":"market-leader-share:us-social-media-referral-traffic","signalDomain":"markets","signalMetricId":"market-leader-share","signalMetricLabel":"Leading-participant share","entityId":"mkt-social-referral","entityCode":"us-social-media-referral-traffic","entityLabel":"Social referrals","unit":"percentage_points","priorPeriod":"2025","priorYear":2025,"priorValue":57.45,"latestPeriod":"2026","latestYear":2026,"latestValue":68.94,"delta":11.49,"deltaPercent":20,"direction":"increased","sourceIds":["statcounter-social-referral-us-2026"],"sourcePublishers":["StatCounter Global Stats"],"observation":"Social referrals moved from 57.5% in 2025 to 68.9% in 2026 (+11.49 percentage points).","interpretation":"The latest encoded Leader share anchor is higher within this documented market series. The change alone does not identify a cause or establish competitive harm.","researchQuestion":"Which participant-share changes account for the structural movement, and are the denominator and coverage stable across both anchors?","signalGuardrail":"This is a within-profile comparison governed by the documented statcounter all-platform social-media referral share boundary. It is not annualized and should not be compared as a common national series with differently defined markets.","insightGuardrail":"Competition Insights are editorial summaries of exact, source-custodied Competition Monitor rows. A dispatch may inventory several signals, but it does not average unlike measures, create a composite score, rank research importance, establish a legal market, identify a cause, or prove market power, competitive harm, liability, or enforcement performance. The direction count is an inventory, not a vote about competition. HHI points, CR4 points, and leading-share points across different products and periods are not pooled or ranked.","entityHref":"/markets/us-social-media-referral-traffic","explorerHref":"/trends?markets=us-social-media-referral-traffic&metric=leaderShare","monitorHref":"/economy/monitor?signal=market-leader-share%3Aus-social-media-referral-traffic#competition-monitor-console"},{"dispatchId":"market-change-field","dispatchSlug":"market-structure-change-field","dispatchTitle":"Latest market-structure signals moved in both directions.","dispatchScope":"domain-readout","dispatchDomain":"markets","dispatchUpdatedThrough":"2026-07-21","dispatchHref":"/insights/market-structure-change-field","publicationSeriesNumber":"AR-CI-2026-01","publicationSeriesTitle":"Competition Insights","publicationAuthor":"Antitrust Radar Research Team","publicationDate":"2026-08-12","publicationUpdatedAt":"2026-08-12","publicationVersion":"1.0","publicationStatus":"current","signalId":"market-hhi:us-mobile-wireless-service","signalDomain":"markets","signalMetricId":"market-hhi","signalMetricLabel":"Herfindahl-Hirschman Index","entityId":"mkt-wireless","entityCode":"us-mobile-wireless-service","entityLabel":"Wireless service","unit":"hhi_points","priorPeriod":"2021","priorYear":2021,"priorValue":3596,"latestPeriod":"2023","latestYear":2023,"latestValue":3550,"delta":-46,"deltaPercent":-1.3,"direction":"decreased","sourceIds":["fcc-2024-cmr"],"sourcePublishers":["Federal Communications Commission"],"observation":"Wireless service moved from 3,596 in 2021 to 3,550 in 2023 (-46.0 HHI points).","interpretation":"The latest encoded HHI anchor is lower within this documented market series. The change alone does not identify a cause or establish competitive harm.","researchQuestion":"Which entry, exit, share, switching, price, quality, or capacity evidence can explain the movement inside this exact market boundary?","signalGuardrail":"This is a within-profile comparison governed by the documented fcc source-reported hhi by economic area boundary. It is not annualized and should not be compared as a common national series with differently defined markets.","insightGuardrail":"Competition Insights are editorial summaries of exact, source-custodied Competition Monitor rows. A dispatch may inventory several signals, but it does not average unlike measures, create a composite score, rank research importance, establish a legal market, identify a cause, or prove market power, competitive harm, liability, or enforcement performance. The direction count is an inventory, not a vote about competition. HHI points, CR4 points, and leading-share points across different products and periods are not pooled or ranked.","entityHref":"/markets/us-mobile-wireless-service","explorerHref":"/trends?markets=us-mobile-wireless-service&metric=hhi","monitorHref":"/economy/monitor?signal=market-hhi%3Aus-mobile-wireless-service#competition-monitor-console"}]}