The document summarizes a white paper by Bullhorn Reach on social media use by recruiters in 2012. It finds that LinkedIn is the most widely and effectively used platform, with recruiters having a median of 616 connections on LinkedIn. Twitter presents an opportunity to reach candidates more efficiently through search. While Facebook has the most users, it is the least effective for recruiters to post jobs. The white paper predicts further expansion of recruiter social media use in 2012 especially on LinkedIn and Twitter.