When you leave a comment on a website using Facebook, the comment can also be published on the user's profile. It is a way to share content and generate conversation with friends.
But spammers do not miss one and have been taking advantage of this comment system for a long time to deceive users and propagate links. A few days ago I came across the following post on a wall:
It seems to be a normal or natural comment on a news item that goes viral, but in reality it is a comment that was published on the wall without the user noticing. The image by the way is not a real Gif either, but a simple image to attract more attention.
When trying to see the Gif or access the site, a popup that simulates being a Captcha is displayed:
Captchas are small tests that are used to fight spam and robots that perform automatic tasks are everywhere, even Google shows them in its search engine when many queries are made in a row.
So filling in a captcha is normal nowadays and is not usually associated with something wrong, but this captcha is false and is found camouflaging the Facebook comment widgetWhen the visitor solves it, he actually ends up making a publication on his wall without knowing it:
It is very well done and there is a whole network of similar sites (spam sites) that are taking advantage of this technique to generate traffic, so be careful with the links that are followed in the large social network and false captchas to avoid sharing unwanted content .