Matthew Shaer:

Unfortunately, if these haters ditch Facebook, they’re going to find a paucity of options. Where will they go? MySpace is pretty much dead, except as a music platform. Twitter is cool, but it doesn’t offer the same depth as Facebook. There’s Diaspora, but as of now, the site is just a dream rattling around in the heads of a few college students.

I obviously disagree (except with the MySpace and Diaspora comments).