It’s a fact that companies are still filling 80% of their jobs with active candidates – candidates who are actively seeking other employment. Yet, most of the A-playing talent is found within the passive pool, a much smaller pool. How in the world will you be able to hire quality passive candidates if they are not applying for jobs? The most valuable and effective tool for finding and communicating with passive candidates is LinkedIn!
LinkedIn is one sure-fire way to locate those prime-candidates that are not actively seeking other employment. It's as if you are walking around outside the local restaurant, not paying attention, and "OH!" there is a $20 bill that is off to the side, stuck in a bush. Now, you weren't looking for a $20 bill, and oh what an odd occurence that you have found one minus the effort. LinkedIn is your bush to find your $20 bill...uh...candidate.
The quoted first paragraph is from Strategic Advisor, Jennifer Millman.