(Credit: MTV)

Once the global leader in youth culture, MTV’s attempts to address the social-networking craze have seemed a little puzzling sometimes (the Twittering Moon Man?) But now we’ve seen another piece of the entertainment brand’s puzzle: Backchannel…, a play-while-you watch game that’s one part chat room, one part Digg, and one part Mystery Science Theater with a Mean Girls twist.
It’s debuting on Monday night with that evening’s episode of wildly popular reality-soap The Hills.
Here’s how Backchannel works: Watch the show (for now, only The Hills is on Backchannel, but later this fall it will

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