Users are warned to think twice before purchasing those shiny and extremely cheap Ray Ban glasses promoted on Facebook. There's a big chance they are fake. That's the conclusion of the two researchers on cybersecurity who evaluated more than a thousand of Facebook advertisements are fake signature items like Ralp Lauren, Ray Ban and Louis Vuitton bags.

At first glance, the ads seem legitimate and lead to sites that sell authentic items. The researchers informed Mashable that, "You don't know where you're going to end up, and in many cases your credit card is at risk, thanks to obscure payment systems backed by companies you have no idea who they are."

Agostino Specchiarello and Andrea Stroppa created a 12 dummy Facebook accounts and picked 1,067 sample ads. The two cybersecurity experts concentrated on the 180 luxury and fashion ads, 43 of those are websites selling fake items.

Those websites were created by using different strategies to trick buyers. They always had legit looking links, using payment system firms and fake logos of security guarantees. According to the researchers, those domains were registered sites from China, and their owners used email accounts from the said country. Although, it was not yet proven that those websites are operated by Chinese organizations. Furthermore, the researchers said the social network is liable for protecting its users, even if there are difficulties to detect these advertisements. "Facebook should do more, and must do more against this."

"We prohibit fraudulent or misleading claims or content, and to enforce our terms and policies, we have invested significant resources in developing a robust advertising review program that includes both automated and manual review of ads." a Facebook representative told Mashable.

On the other hand, the researchers have noted that since they began studying the issue. Most of the illegal ads have been deleted.