If you, like me, live in the EU, Facebook is now entirely clamping down and forcing free users to make their personal data available for monetization.
Attempting to access any Facebook domain and perhaps also other meta products will redirect you to the following prompt with a choice between either accepting the monetization of your user data, or coughing up a region-dependent monthly subscription fee: base (for me ~10€) + an additional fee (~7€) for each additional facebook or instagram account you have.
Now, the hidden third option. At an initial glance, it seems like there is no other option but to click one of the buttons - however, certain links still work, and grant access to important pieces of functionality through your web browser.
If anyone has information to add regarding Facebook or Instagram, please do share it. I've only (begrudgingly) used the former up until now, but I know many others use Instagram and don't feel like giving a single cent (nor their personal info) to Meta.
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https://www.facebook.com/dyi - perhaps most important of all, now is a good time to make a request to download your Facebook data. Don't forget to switch to data for "all time" and "high quality" if you intend to permanently delete your account.
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https://www.facebook.com/your_information - here you can find and manage your information, but crucially also access Facebook messenger.
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The messenger app: Still hasn't prompted me with anything, though I expect that will change in the not too far future.
Currently my plan is to use messenger to inform any important friends that I intend to leave FB, and where they'll be able to reach me in the future.
Friendica should fit the bill right there for you. Or if you don't want ActivityPub, check out diaspora*. There's also Hubzilla which uses AP as well, but internally it uses its own Zot protocol.
I was looking into Friendica, and it also looks promising. But the lack of an ios app may be a dealbreaker for some of my friends.
Diaspora has the same issue, although the integration with other social media is interesting.
Huzilla is a bit more for filesharing, isn't it?
All in all, I think Friendica is indeed one of the better bets.