This document discusses using social networking for hiring, internal collaboration, and customer engagement by medical science liaisons (MSLs). It provides tips for using LinkedIn for recruiting and hiring. It also recommends using social business software like Yammer or Jive to facilitate internal collaboration for non-co-located teams. Finally, it argues that MSLs can engage thought leaders through their presence on networks like LinkedIn, QuantiaMD, and Doximity, as over 30% of thought leaders may already be on such networks. An example virtual community set up by a pharmaceutical company found KOLs had a positive response, though the sample size was small.