Partyhero - Pass your friends the aux!
Netflix Party - Netflix Party is an extension for watching Netflix remotely with friends and family for movies nights with that long-distance special someone.
Join My Playlist - Listen to music live together with your friends in Spotify.
Metastream - Watch streaming media with friends
OutLoud Social Jukebox - Control the music with your friends in real-time
StreamParty - StreamParty is a watch communiry, that allows you to watch video streams in sync with the people you care about, on multiple services.