The English edition of Wikipedia will be blacked out tomorrow. According to a press release, the blackout is to protest two bills pending in Congress focused on piracy and copyright violations by websites based offshore: the Stop Online Piracy Act (SOPA) (H.R. 3261) and the PROTECT IP Act (PIPA) (S. 968). The Wikipedia community asserts that this “legislation will harm the free and open Internet and bring about new tools for censorship of international websites inside the United States.”
Several other websites— including BoingBoing and Reddit—are also participating in the blackout. Google, Facebook, and Twitter are not blacking out their sites but have expressed opposition to SOPA and PIPA in a letter to Congress printed in the New York Times.