I quite FB in around 2009 with the plan of being more productive and it worked really well. I was being constantly distracted by unimportant events from other people. The one interesting thing that happened after that is that some of my "friends" actually contacted me to see if everything was ok with me, when in reality they where validating their egos making sure I didn't block them.
I didn't find my productivity went up. Evidently, I can find enumerable things to distract myself with. I just got fed up with all the political hate flying around. Seems this year things went from people ironically commenting on the things our government does to claiming that anyone in disagreement belongs in a death camp. I just didn't want to see that shit anymore.
Thats fine if it works for you. To me its just noise that pollutes all the things I want to do. You don't have to be a hermit. If avoiding Facebook makes you a hermit, than I think we failed and we're depending too much on a single technology to be social, that doesn't sound right to me.