“The best content is watched live or near-live,” said Alex Iskold, the founder and chief executive of GetGlue, a social TV application that lets users check in and inform their friends about the programs and movies they’re watching. People have become accustomed to chatting along to big television events while on Twitter and Facebook, so that social component “has to be real time,” he said.

Last week, Rdio introduced Vdio, a video version of its site that will let people stream movies and TV shows and tell friends what they are watching while they are watching it.

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