person who publicly helps or gives credibility to a person or organization without disclosing that they have a close relationship with the person or organization

A shill may also be called a 'plant' or a stooge. They are people, usually paid, who promote something. They pretend to be independent.

Shills publicly help or give credibility to a person or organization with which they have a private relationship. Shills operate in media, journalism, marketing, confidence games, or other businesses. A shill may also discredit opponents or critics of their client [1] by character assassination or other means.

Usually, shill refers to someone who purposely gives onlookers, or marks, the impression of an enthusiastic customer. They pretend independence of the seller, marketer or con artist, for whom they are secretly working.

The shill works for the man who does the tricks to extract money from the onlookers. The tricks can be as basic as a street three-shell game,[2] or as complex as a massive stock exchange fraud. All it takes is someone who looks like a fellow player to show big appreciation of the seller's product.

The shill and his client ("the man") rely on crowd psychology to encourage other onlookers or audience members to do business with the seller or accept the ideas they are promoting. With a big audience, such as a magician's show or a political rally, people are often placed in the audience. Then the shill is called a plant or stooge.

What the shill does is similar or identical to what advertising and public relations do. However, it is more obvious that the latter have a vested interest because everyone knows they are being paid for their work. Another place for shilling is auctions.[3]

  1. Client: person or organization in which they have a vested interest
  2. Price, Paul 2001. The real work: essential sleight of hand for street operators.
  3. Whitworth, Dan (July 5, 2010). "Man fined over fake eBay auctions". BBC.