In its earliest days, Facebook was primarily a white and Asian phenomenon. No more. In the first study of the race and ethnicity of its U.S. users, Facebook said Wednesday that blacks and Latinos have joined the social networking giant at a rapid clip in the past several years.

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Social networks like Facebook, MySpace and Linked-In skew younger and more female than the general population, but the increased diversity of Facebook may be another indication of the maturation of the Internet, as minorities and other groups come on board. With well over 90 percent of young adults and the college-educated population now online, "we're reaching the saturation point in the early adopting population," said Susannah Fox of the Pew Internet and American Life Project.

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