The biggest name in live video game streaming today is Twitch - bar none. That's no reason why Steam, the biggest name in PC game sales and hosting, can't create a competitor. That's exactly what they're doing right this minute with Steam Broadcasting, coming your way in Beta form as early as this afternoon. Steam Broadcasting appears, for now, to be sort of the opposite model Twitch is running. You'll have only to find a friend, click the "Watch Game" button, and wait to be let in.