Facebook did a very good job in reconciling with our childhood friends and long lost relatives. It was the hype in my country after friendster died down. I can say that I spend almost 4-6 hours on Facebook intermittently. What I mean to say is I browse on my Facebook account for a little while, and then I do other work related activity, then browse back again.
However, recently I lost interest in skimming on Facebook, because I noticed that most people just post whatever rants they have. Others seems to be a bit of being narcissistic, by posting like 20 pictures with the same background and selfie of themselves. So I just open my Facebook once in a while to catch up with what's latest in my family and friends.