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 chose not to sign up immediately after witnessing what it did to my friends. I feel I did right thing. a month ago, my grandma who lives in a very remote place (in rural India) was dissapointed to not find my profile or pic in fb app.