From the Guardian:
The first time I joined Facebook, I had to quit again immediately. It was my first week of university. I was alone, along with thousands of other students, in a sea of club nights and quizzes and tedious conversations about other people’s A-levels. This was back when the site was exclusively for students. I had been told, in no uncertain terms, that joining was mandatory. Failure to do so was a form of social suicide worse even than refusing to drink alcohol. I had no choice. I signed up.
Users of Facebook will know the site has one immutable feature. You don’t have to post a profile picture, or share your likes and dislikes with the world, though both are encouraged. You can avoid the news feed, the apps, the tweet-like status updates. You don’t even have to choose a favourite quote. The one thing you cannot get away from is your friend count. It is how Facebook keeps score.