In January Google rolled out a data refresh for Panda and further improvements to their algorithm. 

In a post from last year  (Finding high quality sites in search) Google explains that these types of changes are aimed at improving the rankings of high quality sites and lowering those for sites with poor quality.

In 2012 they have improved how Google Panda interacts with the indexing and ranking systems, integrating it further into their "pipelines.

SOPA (the Stop Online Piracy Act) is designed to allow content owners and Governments to block internet access to websites containing unauthorised copyright material by obtaining a court order.

Payment gateways, internet service providers, search engines and advertisers would be forbidden from doing business with overseas websites which have court orders against them.

Wikipedia, Reddit and Boing Boing have all taken their sites offline in protest against the proposed act.