Wikipedia and others participated in an unprecedented Internet blackout Wednesday. The site blacked out its content and replaced its usual homepage with a message warning visitors about the two anti-piracy bills. Other sites that did much the same thing included Reddit, BoingBoing, Tucows and an estimated 10,000 or more smaller websites. More than 4.5 million signatures were collected and two million emails sent through groups such as the Electronic Frontier Foundation (EFF), Demand Progress and Fight for the Future.”]
Source: https://www.csoonline.com/article/2130686/anti-sopa–pipa-protests-to-continue.html