So you've got a great job that's waiting to be filled at your company, and you decide you want to tap into the already measured power of social media recruiting. You start to wrestle with the big kahuna, LinkedIn, and you're also covering niche social media sites for your industry. But you may be ignoring an intensely powerful tool hiding right under your nose -- Facebook. The social media mega-site has proven successful for snapping up young professionals, but it can be a great resource for finding talent at any level.