A young woman on Chatroulette leads men to believe she's going to take off her shirt and then turns demonic to promote upcoming movie The Last Exorcism. Via.
Well, at least an advertisement that's fun to watch. As I understand it, this "megawhoosh" viral spot featuring a wild ride on a water slide is supposed to promote Microsoft Office at a related site. It's all explained here. Via.
I vaguely recall that toward the beginning of the buzz about Cloverfield, there was a mysterious viral marketing campaign called Ethan Haas Was Right that was commonly believed to be a promotion for Cloverfield. I'd forgotten all about it, until a random blog post (with some cool concept art) mentioned it today. Turns out the Ethan Haas campaign was for a totally unrelated role playing game called Alpha Omega.
Photos and information here and here. Via Fark, where one commenter suggested it was a related to this website for Lotus. If so, I'm awfully intrigued. A search for faceless people at Youtube turned up several recent videos: