I was talked into creating a FB account by some friends a long time ago. I found that I was losing respect for my friends, as it brought out the parts of them I did not want to know about.

I also noticed a disturbing pattern straight away. FB was pushing these little games at me. The questions in each of the little games were nearly identical to the questions in psych and personality tests I was required to take in the military. To the best of my knowledge FB does not have the clearance for this data, so I deleted my FB account and blocked their domains.

AFAIK, I have not really missed out on anything important by not being a member of that system.