Venture backed Intercasting, the firm behind the Rabble mobile social networking service, said today that it has been selected by Boost Mobile to power a new social networking feature on Boost's ANTHEM service. Financial terms were not disclosed. Intercasting said that it will provide an interface to social networking sites including LiveJournal, Vox, Xanga, AsianAve.com, BlackPlanet.com, Faithbase.com, GLEE.com, MiGente.com and its own Rabble site for Boost. Intercasting is backed by Avalon Ventures, Masthead Venture Partners, and Venrock Associates, and is based in San Diego.