subliminal messages?

Should chatrooms and social networking sites use subliminal messaging to influence positive online interactions? It may seem like a far stretch, but the makers of Facebook, MySpace, LiveJournal, and many other sites are considering it possible. By posting positive and influential phrases around the sites, sort of embedded in the ads and headliners, scientists believe that users may actually feel a difference in mood. This postive shift will then hopefully reduce the amount of negative activity that goes on through the internet.