I've been on Facebook for almost two years. This is what i can tell you from my own personal experience. It's fun it's informative it's instant and it's extremely public and addictive. For that reason i closed my accounts. I had two accounts. One personal and one professional. At first i closed my personal one. Then i saw i was continuing the same trends from my personal account. So i quit it too. I don't need my personal life on a social network. I don't need problems at work because of it either. So off it went.