I know some use Raptr here, which is a really nice website/client that lets you track games (and see how many billions of hours you've spent playing something :P), compare yourself to them and they recently have been starting to do a rewards scheme (mostly for the USA while in beta stage).

www.raptr.com is the website if you're not signed up and want to take a look, for those who are signed up and want to add me my page is http://raptr.com/MalevolentFiend

Feel free to add your link below if you want others to add you.