As many as 7,000 Web sites could go dark today in protest of the Stop  Online Piracy Act (SOPA) and the PROTECT IP Act (PIPA), according to  community organizers. 
http://www.pcmag.com/article2/0,2817,2399009,00.asp
http://www.pcmag.com/article2/0,2817,2399009,00.asp