Almost as soon as Guang-Yu Xu was laid off from his engineering post at a Silicon Valley Internet company last month, he visited LinkedIn.com and updated his job status from "current" to "past."
Through their interconnected contacts, he soon heard from headhunter Robert Greene, one of more than 530,000 recruiters trolling the professional networking site for job candidates. Within a few weeks, Xu had three offers. He started at Mint.com, a personal finance website, two weeks ago.
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