See the most talked about things with data from the Facebook and Instagram blog.
Twitter data has lots of interesting infographics with initial data on talked about athletes and moments.
Comscore has a brief update on the most successful social media engagement
The Guardian newspaper innovation labs has been experimenting with mobile notifications during the Games.
For some more examples of innovative digital media coverage of the games see the great list of links and explanations from Nieman Lab. It covers the work of major newspapers including the Wall Street Journal and New York Times.