StreamParty - StreamParty is a watch communiry, that allows you to watch video streams in sync with the people you care about, on multiple services.
Netflix Party - Netflix Party is an extension for watching Netflix remotely with friends and family for movies nights with that long-distance special someone.
Metastream - Watch streaming media with friends
Kosmi - Digital Hangouts Reinvented
BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!
WatchParty.me - WatchParty.me is a video streaming platform where you can watch streams with your friends in a private virtual lobby.