Online bingo is the game of bingo (US|UK) played on the Internet. Global Betting and Gaming Consultants estimates the global gross gaming yield of bingo (excluding the United States) was $0.5 billion USD in 2006; they forecast it will grow to $1.0 billion USD by 2010.
Unlike balls used in regular bingo halls, online bingo sites use a random number generator. Online bingo halls usually offer online casino games as well as the bingo, but the actual bingo play works almost exactly like playing online poker or online casino games, with everything being virtual. One notable feature of online bingo is the chat functionality. Successful online bingo sites foster a sense of community and interaction between players.

One of the earliest known online bingo games, launched in 1996, was a free bingo game called “Bingo Zone”. To play, members had to provide demographic information; in turn, members would receive targeted ads based on the demographics provided. Another early pioneer for free online bingo was Uproar, which launched Bingo Blitz in 1998. Source : wikipedia.org