Twitch, possible $1 billion YouTube target, emerged from unlikely journey of four friends

Twitch.tv, the hugely popular video game broadcasting service that YouTube reportedly wants to buy for $1 billion, is the unlikely product of an extraordinary adventure that four young friends embarked upon in 2007 when one of them, Justin Kan, strapped a camera to his head and for eight months streamed the events of his life live to the Internet, all day and night...