YouTube may rule supreme in the melded world of online video and social networking, but Microsoft has a new trick up its sleeve that it hopes might steal some eyeballs away from the competition. Launching today in 20 countries and 12 languages is Microsoft’s Messenger TV service, integrating online video directly into Microsoft’s Live Messenger application. “Watching online video is no longer about one person in front of their computer, it’s now a social experience. Users can now share a selection of free content