This was a response I posted to a thread on Google Buzz about why I closed my Facebook account:
When it comes down to it, I got all of the value I was ever going to get out of Facebook. I connected with people I hadn't seen in 20 years. Beyond that initial rush, Facebook has been a complete waste of time.
Facebook can take much of the blame: Mafia Wars, Farmville etc. Complete junk. Annoying. I'm done. I get more value out of the ~500 people I follow on three Twitter accounts, many of which I don't know, than I ever got out of Facebook. Those that matter know how to reach me. No forwarding address required.