Watch2Gether - Watch2Gether is an app that allows multiple people to watch the same content simultaneously and interact with each other while watching.
YouTube - Our mission is to give everyone a voice and show them the world.
Metastream - Watch streaming media with friends
Facebook Gaming - Watch and stream live games on Facebook
StreamParty - StreamParty is a watch communiry, that allows you to watch video streams in sync with the people you care about, on multiple services.
YouNow - YouNow is a free social networking app that allows you to connect with other users via live video broadcast.