The term Ideagoras refers to places on the internet where large numbers of people and/or businesses gather to exchange ideas and solutions. The term was coined by Don Tapscott and Anthony D. Williams in Wikinomics: How Mass Collaboration Changes Everything and originates from the ancient Greek word agora. An agora was an open "place of assembly" in an ancient Greek city-state where trade occurred. It has also been described as the political heart of Athens from 600BC. Wikinomics refers to online ideas marketplaces like InnoCentive as ideagoras.