Twitch was an accident. The live video streaming service, which boasts over 55 million unique users each month, began life in 2007 as "Justin.tv": an all-hours video livestream of co-founder Justin Kan's life. That wasn't the whole point of the service, of course; later that year, "Justin.tv" opened up to the public, who could then "livestream" to various "channels." At its inception, Justin.tv was a form of internet television, offering live broadcasts across a variety of topics. One such topic -- gaming -- took a particularly large portion of Justin.tv's audience. So much so that, in 2011, the company spun out gaming into its own website: Twitch.tv. Three years later and Justin.tv is dead, the company is now known as "Twitch Interactive," and Amazon just bought it for $970 million. Not too shabby for an "accident".