Some startups are betting that Facebook, not LinkedIn, will emerge as the dominant site for professional networking. BranchOut, maker of a careers-focused application on Facebook, has raised $24 million, while Jibe, which makes an HR and job-application app on Facebook, recently raised $6 million. But recruiters have so far remained loyal to LinkedIn, says hiring consultant Debra Feldman. "They're using it over and above any other résumé databases, including their own," Feldman says.

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