Facebook's popularity

Is it becoming more popular than porn? Bill Tancer at Time thinks it is:

It seems that social-networking sites have not only usurped porn in popularity, but they've also gobbled up time Gen Y-ers used to spend on traditional e-mail and IM. When you can reach all of your friends through Facebook or MySpace, there's little reason to spend time in your old-school inbox. So, if social networking is becoming e-mail 2.0, then perhaps Microsoft's recent $240 million dollar payout for such a small stake in Facebook isn't that ridiculous.