an Internet-based forum for an interest group; also called bulletin board , discussion board , interactive message board
Message boards usually offer chat, email, and ability to share documents.
mid-15c., "place of assembly in ancient Rome," from Latin forum "marketplace, open space, public place," apparently akin to foris, foras "out of doors, outside," from PIE root *dhwer- (see door). Sense of "assembly, place for public discussion" first recorded 1680s.