I just deleted my Facebook account. Facebook documentation and UI was very clear about my data being permanently deleted after 14 days, see https://www.facebook.com/help/224562897555674/
Much better than Twitter's unclear statements about "deactivation", see https://writing.exchange/@quimgil/100080585429211224. If they really delete the data, obviously.
The social network of the future: No ads, no corporate surveillance, ethical design, and decentralization! Own your data with Mastodon!