Doing it in 3 hours is cool, but not really sold on the concept. A better model would be to monitor rate of facebook activity (logins, posting, messaging). There's a difference between using Facebook as a service and being addicted to it...sometimes FB is the best way to reach people (who for some reason don't want to use email anymore). The addiction part comes when you are constantly posting and "liking" and responding, at random intervals throughout the day (i.e. when you have a spare moment with your phone).