1) I trust them when they say they don't sell it, technically.
However they probably do sell information/meta data they themselves have mined from my data, which they probably claim is harmless and de-personalized.
FB effectively gave data away to app developers (e.g. Cambridge analytica).
They got something in return - as they do with all their partners - but this is not generally considered a sale, and often not even a trade.
Re:Ask HN: Alternatives to Google Photos?
by alisonkisk on Monday May 31, 2021 @12:27PM
(#27345709)
Users gave data away to app developers, not Facebook.
2 seems more plausible.