When the Facebook Ad Highlighter is installed, ads in the News Feed are greyed out and written over with the words "this is an ad."
Last week, Facebook had announced that it was taking measures to prevent ad blockers from working.
Two days after Facebook's announcement, Adblock Plus, the biggest ad blocker informed users of a simple tweak to their settings that would defeat the social media websites' blocker blockade.
In a blog post, Arvind Narayanan from Princeton University in the US wrote "what is happening here is that Facebook's HTML code for ads has slight differences from the code for regular posts, so that Facebook can keep things straight for its own internal purposes."
Researchers created a prototype tool that detects Facebook ads without relying on hidden HTML code to distinguish them, 'MIT Technological Review' reported.
It looks at the parts of the Web page that are visible to humans. Facebook Ad Highlighter simply looks for and blocks any posts with a giveaway "sponsored" tag.
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