Just read about this on Twitter. If any of you play games by Valve on Steam that have an online play mode (eg: TF2 and CS:GO), DO NOT LAUNCH THEM! Some of Valve’s source code has been leaked, which means that hackers can gain access to your Steam account and your computer. Please wait until Valve have released a patch to fix the issue.
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Only for Team Fortress 2 and Counter Strike games, not all the steam games.
Someone has got source code of these two games.
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Oh… Haha… thanks! I haven’t used steam since 2 weeks…
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No, no, no. It wasn’t me. 
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So it’s a Source source code leak 
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