Secret Santa can be a fun way to spice up the holidays by exchanging random gifts with friends or co-workers, but officials are warning that an invitation to exchange presents with a "secret sister" is nothing more than a scam.

Plenty of Facebook and Instagram users have seen posts inviting them to send in $10, promising they'll receive up to 36 gifts in return.

Not only will your "Secret Sister" almost certainly not get you anything, that type of hoax is also illegal.

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The U.S. Postal Inspection Service issued a statement saying it's against the law to "request money or other items of value and promise a substantial return to the participants."

And if the scam feels familiar, Snopes says it's "simply a repackaging of age-old chain letter gifting schemes, the pitfalls of which are both well-known and about as ubiquitous as the practice itself."

This video includes an image from Getty Images.