The most consequential change for marketing teams this year did not come with a press conference. On January 12, 2026, Meta quietly removed the 7-day and 28-day view-through attribution windows from Ads Manager and the Ads Insights API, leaving 1-day view as the only view-through option left (ppc.land, 2026; Meta for Developers, 2026). Reported conversions dropped 15 to 40 percent overnight for accounts that relied on those longer windows, with B2B and other long sales-cycle advertisers hit hardest, since some had been attributing 30 to 40 percent of conversions to the window Meta just deleted (ppc.land, 2026). It is one of three moves this year that all point in the same direction: the platforms are pulling back the signal marketers used to measure with, and the industry's answer is to own more of that data itself.
Meta narrowed what it will count
Meta's change was framed as an accuracy fix. The company told developers the removal was meant to reduce discrepancies between the API and Ads Manager reporting (Meta for Developers, "2026 Out-Of-Cycle Changes"). In practice, any system still requesting the 7d_view or 28d_view parameters now gets zeros back with no error thrown, which means dashboards built before January can silently under-report without anyone noticing (ppc.land, 2026). Meta also tightened historical data retention in the same update: unique and hourly breakdowns now cap at 13 months, frequency data at 6 months, with marketing mix modeling data moved to asynchronous jobs only (ppc.land, 2026). A second change in March 2026 separated click-through from engage-through attribution, replacing the older engage-view model (Jon Loomer Digital, 2026).
What marketing teams should do: audit any reporting pipeline still pulling 7d_view or 28d_view fields, since those numbers are now zero, not missing. Reconcile Meta-reported conversions against a source you control, such as server-side conversion tracking or CRM-attributed revenue, before presenting quarter-over-quarter comparisons that span the January cutover.
Google finished killing Privacy Sandbox
Google's retreat from third-party cookie deprecation, announced in April 2025, has now run its full course. In October 2025 Google confirmed it was retiring the remaining Privacy Sandbox APIs, including Attribution Reporting, Topics and Protected Audience, across both Chrome and Android (AdExchanger, 2025). Chrome began deprecating those APIs in Chrome 144, released in January 2026, with full removal targeted for Chrome 150 in July 2026 (Privacy Sandbox status page, privacysandbox.google.com). The UK's Competition and Markets Authority closed its four-year investigation into the initiative on October 17, 2025, releasing Google from the commitments it made when cookie deprecation was still the plan (Clifford Chance, 2025). Third-party cookies remain active in Chrome with no removal timeline.
What marketing teams should do: any integration built against Attribution Reporting or Topics needs a replacement plan before Chrome 150 ships. Teams who paused cookie-deprecation contingency work when Google reversed course in 2025 should not treat that pause as permanent. Chrome still runs on third-party cookies today, but Safari and Firefox already block them by default, so cross-browser measurement gaps are not going away regardless of what Chrome does next.
Adobe bet on data collaboration instead of platform signals
While Meta and Google were cutting back what they report, Adobe expanded the alternative. Adobe Real-Time CDP Collaboration, a clean-room product that lets advertisers and publishers match first-party audiences without exposing the underlying customer data, went generally available in the US, Canada, Australia and New Zealand in February 2025 and expanded into EMEA on March 2, 2026, with PRISA and iq digital named as initial regional partners (Adobe, business.adobe.com, 2026). The product is built into Adobe's existing Real-Time CDP rather than sold only as a standalone tool, which lowers the lift for customers already on that platform (Adobe, business.adobe.com, 2026).
What marketing teams should do: clean rooms solve a narrower problem than platform attribution did, matching known audiences across two parties' first-party data, not reconstructing a customer journey across the open web. Teams evaluating this category should confirm what a given clean room can actually measure before treating it as a drop-in replacement for the attribution windows platforms are removing.
What to watch next
Chrome 150 ships in July 2026, the deadline for full removal of the remaining Privacy Sandbox APIs. Marketing teams with integrations still calling those APIs have roughly eleven months from this post to migrate before the deprecation Google announced in January reaches Chrome's stable channel.
Sources
- ppc.land. "Meta restricts attribution windows and data retention in Ads Insights API." 2026. https://ppc.land/meta-restricts-attribution-windows-and-data-retention-in-ads-insights-api/
- Meta for Developers. "2026 Out-Of-Cycle Changes." 2026. https://developers.facebook.com/documentation/ads-commerce/marketing-api/out-of-cycle-changes/occ-2026
- Jon Loomer Digital. "How Meta Ads Attribution Works in 2026." 2026. https://www.jonloomer.com/meta-ads-attribution-2026/
- AdExchanger. "Google Pulls The Plug On Topics, PAAPI And Other Major Privacy Sandbox APIs (As The CMA Says 'Cheerio')." 2025. https://www.adexchanger.com/privacy/google-pulls-the-plug-on-topics-paapi-and-other-major-privacy-sandbox-apis-as-the-cma-says-cheerio/
- Google. "Privacy Sandbox feature status." 2026. https://privacysandbox.google.com/overview/status
- Clifford Chance. "The cookie doesn't crumble after all: UK competition authority releases Google's 'Privacy Sandbox' commitments." 2025. https://www.cliffordchance.com/insights/resources/blogs/antitrust-fdi-insights/2025/10/uk-competition-authority-releases-google-privacy-sandbox-commitments.html
- Adobe. "Adobe Real-Time CDP Collaboration is Now Available in EMEA, with PRISA and iq digital as initial partners in region." 2026. https://business.adobe.com/uk/blog/introducing-adobe-real-time-cdp-collaboration-in-emea