Don't fall for the 'Secret Sister Gift Exchange' that's been circulating on Facebook and other social media sites. It's a ho-ho-hoax.

Not only is the 'digital chain letter' a scam, it's against the law and the US Postal Service has posted a warning on the hoax. "They're illegal if they request money or other items of value and promise a substantial return to the participants."

Here's how it works:

1) Send one gift value at least $10 to secret sister #1 below.

2) Remove secret sister's name from #1; then move secret sister #2 to that spot.

3) Add your name to #2 with your info.

4) Then send this info to 6 other ladies with the updated name info

5) Copy the secret sister request to your wall. If you cannot complete this within 1 week please notify me, as it isn't fair to the ladies who have participated and are waiting for their own gifts to arrive. Soon you should receive 36 gifts! Seldom does anyone drop out because it's so much fun to send a gift to someone you may or may not know.

Chain letters are a pyramid scheme and have been around for years but people are still falling for it. Some are even posting photos on social media of the gifts they've allegedly received or sent.

MORE: Almost Getting Scammed Out of Two Grand

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