That may seem like a ridiculous question, but a recent study found more than 20 million Americans have multiple Social Security numbers associated with their name in commercial records. The research was conducted by ID Analytics, a San Diego-based company that provides services to both detect identity fraud and to assess consumer identity risk and creditworthiness. The study found that rather than serving as a unique identifier, more than 40 million SSNs were associated with multiple people. "Our research shows that Social Security numbers, contrary to popular perception, do not uniquely identify an individual," said Stephen Coggeshall, chief technology officer...