The Streisand effect is a primarily online phenomenon in which an attempt to hide or remove a piece of information has the unintended consequence of publicizing the information more widely. It is named after American entertainer Barbra Streisand, whose attempt in 2003 to suppress photographs of her residence inadvertently generated further publicity.
Similar attempts have been made, for example, in cease-and-desist letters, to suppress numbers, files and websites. Instead of being suppressed, the information receives extensive publicity, often being widely mirrored across the Internet or distributed on file-sharing networks.
Mike Masnick of Techdirt coined the term after the singer and actress, citing privacy violations, unsuccessfully sued photographer Kenneth Adelman and Pictopia.com for US$50 million in an attempt to have an aerial photograph of her mansion removed from the publicly available collection of 12,000 California coastline photographs. Adelman said that he was photographing beachfront property to document coastal erosion as part of the government sanctioned and commissioned California Coastal Records Project. As a result of the case, public knowledge of the picture increased substantially; more than 420,000 people visited the site over the following month.