Emply lets you post job ads to social networks. So what, you ask? It also lets you add incentives for people in your networks to spread the word. Today you can add a sweepstake of Amazon gift cards amongst everyone that retweeted or shared your job posting.
Emply is used by small and medium businesses who want to hire the best but can't always afford to hire a full-service recruiter. These companies usually have reasonable social media presence, Emply just adds the incentives and stats engine.