Otter - Remember, search, and share your voice conversations
Metastream - Watch streaming media with friends
Plutoview - Shared browsing solution for remote group collaboration
Watch2Gether - Watch2Gether is an app that allows multiple people to watch the same content simultaneously and interact with each other while watching.
Dead Simple Screen Sharing - Simple screen sharing and audio conferencing software.
StreamParty - StreamParty is a watch communiry, that allows you to watch video streams in sync with the people you care about, on multiple services.