EDIT: thanks for the responses. Will block at DNS :)
Does shit break because something, something FB SDK? Nope, at least not shit I care about, and not FB.
But for the most part, I get to mostly forget that FB even exists.
Since FB lacks strong values it gets imposed on the wider community, but such is life. The only true option is using or building alternatives. Trying to chain the monster, where every individual positive attributes always has to be controlled and directed from some other central body, whom we then also have to trust with even more power, sounds like a losing game to me.
Not using FB isn't that difficult anyway. There's plenty of group messaging apps that achieve much of the same.
Having stated that, consider if you eliminate Facebook from your life and have issues on the web, and the answer to those issues is not "create a Facebook account" then it should be relatively safe to remove Facebook from your life.