http://www.statemaster.com/encyclopedia/Debunker
[quote]Encyclopedia > Debunker

A Debunker is an individual who strongly believes that certain claims are false, exaggerated, unscientific or pretentious and therefore discredits and exposes them.[1] Topics that many debunkers focus on include U.F.O.s, claimed paranormal phenomena, alternative medicine, research outside mainstream science, or pseudoscientific subjects. The term debunker is applied when a person functions as an activist and performs research, writes articles, holds speeches, conducts seminars, or engages in other activities with the specific intent of disproving what the debunker believes to be a dubious, bizarre, or abnormal claim, such as those about U.F.O.s or other paranormal phenomena, and hopefully conclusively disproves the validity of the event and/or object. â