I deactivated my first account 8 years ago, but got back on to re-connect with my old pals and acquaintances from back in the day. For that reason, it was fantastic.
After another year, I realized that I can't actually say ANYTHING interesting on this platform without offending someone. There's a lot of variety in my crowd. I have the sense IRL to know that not everything is for everybody, but that doesn't matter much on Facebook unless you want to spend hours and hours hand-crafting subsets of your friends for different topics (I don't). And I have zero interest in posting selfies or status updates of what's going on in my life, so that made the platform exceedingly boring and a waste of time for me. It's a shame, because it does work really well for "connecting" with people (in the shallowest sense of the word).
social pressure predates humans. it's pervasive and our teenage years (especially) are spent coping with/negotiating that. the difference with facebook is that it's potentially unbounded in reach and visibility (in nearly all cases it's not, but every once in a while, something blows completely out of its social circle). as with many modern phenomena, the risk-aversion this induces is out of proportion with the actual risks because of that potential (but not actual) reach and visibility, amplified by memetic social networks that trade in novel (whether true or false) information. in short, the worry over the effects of offense are greater than the potential effects themselves.