A sockpuppet is an online identity used for purposes of deception. The term, a reference to the manipulation of a simple hand puppet made from a sock, originally referred to a false identity assumed by a member of an Internet community who spoke to, or about, themselves while pretending to be another person. The term now includes other misleading uses of online identities, such as those created to praise, defend or support a person or organization, to manipulate public opinion, or to circumvent a suspension or ban from a website. A significant difference between the use of a pseudonym and the creation of a sockpuppet is that the sockpuppet poses as an independent third-party unaffiliated with the puppeteer. Many online communities attempt to block sockpuppets.
The term "sockpuppet" was used as early as July 9, 1993, but did not become common in USENET groups until 1996. The first Oxford English Dictionary example of the term, defined as "a person whose actions are controlled by another; a minion," is taken from U.S. News and World Report, March 27, 2000.
The history of reviewing one's own work under another name predates the Internet. Walt Whitman and Anthony Burgess both reviewed their books under pseudonyms. Another notable example was Benjamin Franklin.
Sockpuppets may be created during an online poll to submit multiple votes in favor of the puppeteer. A related usage is the creation of multiple identities, each supporting the puppeteer's views in an argument, attempting to position the puppeteer as representing majority opinion and sideline opposition voices. In the abstract theory of social networks and reputation systems, this is known as a sybil attack.
A sockpuppet-like use of deceptive fake identities is used in stealth marketing. The stealth marketer creates one or more pseudonymous accounts, each one claiming to be owned by a different enthusiastic supporter of the sponsor's product, book or ideology.