Remember those chain letters of the past?
They arrived in your mailbox along with a promise of riches and a creepy warning of dire consequences if you didn't immediately mail it on to 10 acquaintances.
A new example of holiday fraud is making the rounds: the "Secret Sister" gift exchange. Like the old-fashioned chain letter, it's still illegal — and it promises what it almost never delivers — but it's arriving nowadays via social media, mostly Facebook.