There's been plenty of HR press about the use of social media in doing background checks on job applicants. Some attorneys have gone so far as to recommend that employers should ignore social media completely. I think that's poor advice. If people are willing to do stupid things on their social media sites, they'll be just as willing to do stupid things when working for you. According to a Career Builder/Harris Interactive survey, more than one in three employers rejected job candidates because of their social media activity. The four top reasons were that candidates: 1) Had posted inappropriate photos or information, 2) showed evidence of drinking or drug use, 3) demonstrated poor communication skills, or 4) badmouthed a previous employer.
Risk management is not about eliminating risk. As Walter Olson once stated, "There's no such thing as the golden shore of legal compliance." Ask yourself: Which is the greater risk -- facing a potential discrimination claim because they showed one of the bad behaviors discussed above, or hiring them and allowing them to damage your company? You get the idea of where I think the real risk lies. The bottom line: Don't hire a candidate until you learn everything you legally can about them.