Almost every company (96%) with a job to fill searches LinkedIn for candidates to fill that job. That's what Career Sherpa (the first link above) reports. Companies are also digging into Facebook and Twitter either to identify candidates, and/or to get a gut feel for who those candidates are, and what they might bring to the company (for better or for worse).
There is a useful link at the end of the Career Sherpa article too, to a U.S. News and World Report article explaining to you, the job-seeker, what you can do to make your online presence stand out when companies go a-shopping for fresh blood. I've posted that link above as well.
Some industries, such as higher education, do not look online for candidates. We're a specialized or niche industry; don't overlook your own industries by-ways and fly-ways (we post our jobs for faculty through specialized outlets, like the MLA JIL, the Modern Language Association Job Information List for language and literature).
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