Yes, just like any other site, two laws that was highlighted was the Stop Online Piracy Act (SOPA) and Protect IP Act (PIPA).
WordPress is the action performed after the umpteenth action previously known sites contributed encyclopaedia Wikipedia 'turn off' temporary services.
SOPA or PIPA, in general, will give the rights to the U.S. government to censor foreign websites unilaterally. Was also to follow up piracy action, SOPA also gives the copyright holder, the right to legal remedies against the owner and operator of a website if there is content that violates copyright.
Luckily so far, the site of the new note which reacted strongly Wikipedia and WordPress. Other sites that Google, Facebook, Twitter and Tumblr bandwagon reported not paralyze its services even though they also do not agree that law.
In fact, in Twitter CEO, Dick Costolo called a strike that made Wikipedia is a silly action, as quoted from The Guardian, Wednesday (18/01/2012).