I don't use it much but I have FB friends who have come via a networking group ( we're all self employed and help each other out with contacts.) We 'met' online in the professional group and they added me as a friend.
I've just got pissed off though at how some 'friends' flaunt their political opinions, like to post something contentious to seek attention it seems, or post photos of themselves clearly seeking validation for their new haircut or whatever, or their new boyfriend etc.
Suppose what I'm saying is they just seem tactless because they don't have a clue about the political views of their FB friends or how they may be being provocative.....and I don't want to get into an argument with them on SM.
I just don't see FB as a place to discuss politics, or seek approval for your new haircut- I mean it looks so needy.