Facebook said last Tuesday that it had shut down accounts, apps, pages, and platform access associated with the NYU Ad Observatory due to privacy violations. The company said the bans were due to concerns about a browser extension used by the researchers. The plugin, called Ad Observer, was used by volunteers to copy Facebook ads they saw. This was used to create a public database containing information on who the ads target and how they’re funded. Facebook said the tool collected data about users who had not provided consent. But the researchers claimed those users were advertisers who had consented to make their ads public.

— Laura Edelson (@LauraEdelson2) August 4, 2021 Facebook had said the move was necessary due to a consent agreement with the US Federal Trade Commission, but the FTC itself called this claim “inaccurate.” Senators Mark Warner, Amy Klobuchar, and Chris Coons on Monday sent Zuckerberg a letter asking for further details on why the researchers were banned. In the letter, which has been posted in full by VICE News, the senators expressed surprise with the decision: The senators asked Zuckerberg eight questions about Facebook’s decision to terminate the researchers’ access to the platform. These include requests for further information on which accounts have been disabled, how they violated Facebook’s rules, and whether the company was planning to reinstate them. The senators have asked Zuckerberg to respond by August 20. The letter adds to mounting pressure on Facebook to justify shutting down the research. Critics have accused the company of weaponizing privacy concerns to avoid external scrutiny. Greetings Humanoids! Did you know we have a newsletter all about AI? You can subscribe to it right here.