People watching other people play video games on TV ... yes, that's happening, and it's called Twitch, an online network with, according to Yahoo, "55 million monthly users [who] viewed over 15 billion minutes of content on the service in July, making Twitch.tv one of the world's biggest sources of Internet traffic." Amazon just bought Twitch for $970 million. The Yahoo article points out that Twitch fans are "an important demographic for advertisers" -- mostly male and between the ages...

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