An anonymous posting board using Ping.fm to seed those posts to all available social networks that Ping.fm supports. There is also a blog where Pongonymous Masterson responds to the complaints people have and adds a few of his own.

Website: http://pongonymous.com
Slogan: Get it off your chest

Blog: http://blog.pongonymous.com
Slogan: I have just so many complaints.