MySpace.com - Pam/Jenna - 28 - Female - Scranton, US - www.myspace.com/pambeesley
The actress who plays Pam on the Office has a MySpace page with over 100k friends. Advertisers spend literally hundreds of thousands of dollars to create pages, with contests, polls, wallpapers, games, and god knows what else in order to get that get a fraction of that engagement.
This doesn't cost anything but talent's time. Maybe there's a better way of skinning the viral marketing cat.