From the Pew Research Center:
The second-largest story in the blogosphere last week was far removed from American politics. A BBC report (which received 14% of the links) revealed the new costume for British TV science fiction character Dr. Who. That was followed by a report on a fight over library books in West Bend, Wisconsin (11%) that cost board members their jobs and led to demands for a public book burning.
The fourth most linked-to news story in social media intertwined the thorny issues of politics and race. The arrest of Harvard Professor Henry Louis Gates and the subsequent controversy fueled by remarks from Obama received 8% of the week's links. The Gates arrest also generated significant attention in the mainstream media last week, coming in No. 3 (at 12% of the newshole), according to PEJ's News Coverage Index. The top two stories there were the debate over health care reform (25%) followed by the economic crisis (12%).