Steam is bringing out their own twitch like service called Steam Broadcasting, which lets users watch other users play their games. The only thing you have to do to watch is click on someones profile and go to "watch game" and you'll be able to view the game right away.
Do you like this idea? I sort of do, because it could be fun to get a group of friends together to play, or the usual route of how twitch does things.
Will you use the option?
Read more about it here: Game Front