We shouldn't trust any "special offers" on Facebook, but since we're human, we all fall for these scams anyway. Here's a new one to avoid.

The message appearing on Facebook over the weekend looked something like this:

One Free Amazon.com Gift Card (limited time only)

[LINK]

Amazon is currently giving away gift cards to all facebook users. Click here to get one!

Sophos Senior Security Consultant Graham Cluley says that when you see one of your friends share a link like this with you, it means they've been duped into a scam.

"Be careful not to make the same mistake as them, or you'll just be helping put cash into the pockets of the bad guys," he wrote in the Naked Security blog.

We've been writing about these Facebook scams for what seems like forever. And yet people still fall for these things -- including the folks you would expect to know better. That's why social engineering is such a popular attack tactic. Someone somewhere will always fall for it.