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Dropsitenews published a list of websites Facebook uses to train its AI on. Multiple Lemmy instances are on the list as noticed by user BlueAEther
Hexbear is on there too. Also Facebook is very interested in people uploading their massive dongs to lemmynsfw.
Full article here.
Link to the full leaked list download: Meta leaked list pdf
Unpopular opinion but social media has always been fundamentally public.
Unless they're scraping private dm's on encrypted devices, this should come as no surprise to anyone.
The good news is that nobody has exclusive right to data on federated platforms, unlike other sites that will ransom their user's data for private use. Let's not forget that many of us migrated here because the other site wanted to lock down their api and user data so that they could auction it to google for profit.
The venn diagram of people who did this and "liberals who would have been fine staying on reddit rather than make a site exactly like reddit" is a circle