I signed-up for Facebook personally about three years ago. I check in, at most, twice a day just to see what some of my friends and family are up to.
I am IN NO WAY a Facebook junkie. No Farmville for me. It just seems that there is too much going on in Facebook for my needs. I pass no judgement on those who live in Facebook. Have at it. I myself, would rather spend my social media time with Twitter.
I do realize, however, that there are over 600 million Facebook users, and I should reach out to them.