I’ve posted a few comments about MySpace and Facebook and this post from eMarketer provides data to show actual usage stats between the two. Facebook is gaining on MySpace but still has a long way to go. Interestingly, BlackPlanet is another social site that I use and though the numbers are smaller than MySpace and Facebook, it has a solid following and people spend a lot of time on the network. I need to re-evaluate how I’m using (or maybe not using) BP as a social source for traffic to my other sites. You should add eMarketer to your list of good, fact-based sources for information related to internet marketing.