Watch2Gether - Watch2Gether is an app that allows multiple people to watch the same content simultaneously and interact with each other while watching.
Soor - Discover music a lot better on Apple Music
Metastream - Watch streaming media with friends
humit - A social networking app for music sharing and discovery.
StreamParty - StreamParty is a watch communiry, that allows you to watch video streams in sync with the people you care about, on multiple services.
MTME - A new way to discover music