GitHub continues to build out its unique social network with Contributions, a new addition to profile pages that displays the projects developers created and what they are contributing to, as well as a calendar that shows all of their updates.
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Like a social graph, the repositories with the most starts and watchers makes it to the top of the list.
Given that your open source contributions have become a major part of your cv when you are a programmer this makes completely sense.
Github is making it easier and easier to show what you have created.
http://newnetland.com/2013-01-github-continues-to-build-out-its-unique-social/