Never forget, Facebook (now Meta) had the chance to federate with Friendica but closed the tap ~2015, once more people started joining Friendica. Their mission is to make money, not friends.

It's kind of hard to pin down the histories of these things, since they aren't written about in any blogs that I can find, but here's a GitHub PR referencing this issue:

Since the Facebook connectors aren't supported anymore, they are now removed. Statusnet has been renamed to GNU Social and the API documentation has been updated.

Emphasis mine.