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Facebook announced the most significant redesign of the platform since 2004, aimed precisely to attracting users to groups and to create "a sense by interacting with the natural and social environment, by networking their neural networks with the networks of the nature and with social networks ”(Castells, 2012, p.8). Is this a“ mirror effect ”of Facebook for its users? To answer this fundamental question, which poses the question of the free will of users and the risks of manipulation of the platform on individuals, I carried out a research from a corpus of thirty-five Facebook groups "yellow vests" French and thirty-five "rezist" groups from Romania. This study therefore asks successively:- wich are the "semantic universes" that build up "common sense" coming from humains and which are those constructed by artificial intelligence (AI)?- wich themes brought by humans has been adopted by AI as a mirror and returned to humans in the form of a table tennis game?- who has agglomerated and built "common sense" within the groups: humans or AI, our faithful mirror?