With an ambitious strategy for expansion, Facebook is getting into MySpace's face. Facebook, the Internet's second-largest social network, was originally popular on college campuses, but over the past year it has opened its dorm-room doors to all and seen its membership rolls explode at triple-digit growth rates. Now Facebook, based in Palo Alto, Calif., is inviting thousands of technology companies and programmers to contribute features to its service. They can even make money from the site's users by doing so, and, at least for now, Facebook will not take a cut.

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