I'm assuming this falls under "Cloaking",
Unblock-Facebook.net is currently #1 on Google for 'unblock facebook'. When you visit it, however, you get redirected to zbypass.com, xbypass.com, ebypass.com, etc etc.
The cache, shows something different though: Unblock facebook proxy | Facebook unblock
Does this fall under cloaking? The listing has been up forever, so Google isn't doing anything about it - and this guy is getting a LOT of visitors from it. Could this be a way to combat trademark infringement, but still get the really good listing for the keyword?