Visitors to English-language pages on Wikipedia, regularly ranked as one of the five most popular sites on the Internet, with an estimated 2.7 billion monthly pageviews in the U.S., instead found only a headline stating “Imagine a World Without Free Knowledge.” Stating that the proposed SOPA and PIPA anti-piracy bills “could fatally damage the free and open internet,” the message said Wikipedia would be blacked out for 24 hours and asked visitors to contact their congressional representatives, providing a search box to look them up by ZIP code.