PC Gamer
PC Gamer has been giving away a million copies of a different game each week. This weeks game is linked here:
http://www.pcgamer.com/2014/07/09/free-steam-key/
It is not a scam, I have done it twice myself. I found this by liking their Facebook page. They also post a large amount of deals that different websites have to offer on games.
For this week's give away, you need a twitter account.
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