(NBC News Channel) -- The Secret Sister gift exchange is back on Facebook this year, and the Better Business Bureau is warning consumers to steer clear.
It's actually an illegal pyramid scheme that started circulating on social media in 2015.
Secret Sister promises that you'll get 36 gifts in return for buying just one by recruiting others to participate in the gift exchange.
The U.S. Postal Inspection Services says that participants in the gift exchange could be subject to penalties for mail fraud and illegal gambling.
It's also risky because it requires users to disclose personal information, such as home address.
If you receive a chain letter by mail, email, or social media especially one that involves money or gifts, ignore it.
Report the post to Facebook by clicking on the three little dots in the upper right corner of the post.