What is an ad library?

Ad libraries exist because of political pressure, not marketer demand. After the scrutiny that followed the 2016 US election, Meta launched a searchable archive of political ads in 2018 and extended it to all ads in 2019. Google followed with its Ads Transparency Center in 2023, and the EU’s Digital Services Act now obliges large platforms to maintain public ad repositories. TikTok and LinkedIn run their own.

What you get: the creative itself, the copy, run dates, placements, and the advertiser’s verified identity. What you mostly do not get: spend, reach, and targeting detail, which are disclosed only for political and issue ads in most regions, and performance data of any kind. The sharpest limitation is memory: a standard commercial ad disappears from the archive once it stops running, so the public record is a window, not a history.

For practitioners, the libraries are the primary source for competitor creative research: which angles rivals are running, which formats they favor, when a new campaign broke. The catch is the labor. Checking libraries by hand does not scale past a couple of brands, and because the history evaporates, whatever you did not capture is gone.

How this shows up in Waldo

Waldo scans the Meta and Google ad libraries daily for every tracked brand and stores what it finds permanently: creative, copy, and run dates survive even after the ads leave the public archive, which is what makes days-live analysis possible. One scan alone returned 14,793 Meta ads. The discover_ads MCP tool runs the same search from inside Claude.

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