IMDB, the online movie information and community site owned by Amazon (NSDQ: AMZN), has done another acquisition: it has bought popular movie data site Box Office Mojo, for an undisclosed sum. The acquisition was completed earlier this summer, and with this, IMDB will add to its relatively sparse box office data figures, and Amazon may also integrate some of IMDB’s film and TV credits data on BOM.

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BOM, founded in 1999, is a small three person operation HQed in Burbank, and will remain here. IMDB, meanwhile, has been bulking up of late: it bought an indie movie site last year, and has been adding more video to its site since this summer.