Thousands of websites are limiting content or going completely dark today in a global protest against a pair of anti-piracy bills currently being debated in Congress. The 24-hour protest has been organized to call attention to the Stop Online Piracy Act (SOPA) and its companion bill, the Protect IP Act (PIPA), which would radically expand the enforcement of copyrights in a way critics say undermines a free and open internet. According to SOPAStrike.com, more than 10,000 websites are taking part, including the online encyclopedia Wikipedia and the search engine Google.