It's not that Facebook is required to have social interactions, but you're effectively cutting yourself off from a majority of society because it has become an expected norm. I have "real friends" that I used to talk to over the phone somewhat regularly. Facebook has taken over that network of people and now we post or chat on Facebook.
I experience that not using Facebook has positive filter effects. People that do not understand that I do not like FB are not my friends. Facebook is therefore a good knife to cut me off drivel.
If I didn't use facebook in London then I would simply miss every social invitation that I am given. Many people only use it because of this and would drop it otherwise.
