ABC News has a fun little tidbit. The article is about al Qaeda's communication in the post-9/11 world.

After relying heavily on fixed — and thus vulnerable — Web sites until early 2002, al Qaeda quickly switched to hiding its online operations within more legitimate bulletin boards and Internet sites offering free upload services or connecting through such popular social network sites as Orkut and MySpace. [Emphasis mine.]

MySpace is evil. I knew it! I'm going to start watching my friends list for terrorist activity.