Search on Facebook for “secret sister gift exchange” and you’ll find people posting and re-posting the same message over and over again. The message claims you can buy a gift for $10 or more, add your name to a list and then receive a bounty of 36 gifts. “A lot of friends are doing it, or at least posting about it. Doesn’t sound like a good idea,” Lauren Kidwell said. Kidwell said “secret sister” sounds a whole lot like a pyramid scam she saw years ago. “You only spend $10, get one gift for someone else. Everybody else sends you...