Counter-strike: Global Offensive has a new matchmaking system which takes into account your behaviour across Steam - not just in CS:GO.
Valve's new system assigns every player a hidden value, known as their Trust Factor. This score is derived from how you have played CS:GO - whether you have had reports lodged against you for cheating, for example - but also your activities in other Steam games.
In a blog post explaining the system, Valve said it deliberately avoiding explaining what other activities it was monitoring that would be folded into your Trust Factor value.
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