Citation needed is a tag added by Wikipedia editors to unsourced statements in articles requesting citations to be added. The phrase is reflective of the policies of verifiability and no original research in Wikipedia and has become a general Internet meme.
By Wikipedia policy, editors should add citations for content, to ensure accuracy and neutrality, and to avoid original research. In June 2005, Chris Sherlock, a Wikipedia editor with the username Ta bu shi da yu, created the ‘citation needed’ template, to be added to statements without a citation that needed verification. 413,038 articles in the English Wikipedia are currently marked with the template.
The Daily Omnivore 