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This article seeks to analyze online politics by studying an often ignored subject, YouTube , while focusing on the habits of “ordinary” users. This perspective highlights new, albeit less prominent forms of engagement that nevertheless structure the online public sphere profoundly. Interviews allowed the research to extend beyond simple observation or Web cartography, underscoring the practices and the centrality of YouTube, which itself can be interpreted as an online public square. The video hosting platform constitutes a convergence point at the heart of a fragmented public sphere. The various tools of expression that it proposes (comments, “likes,” hyperlinks) expand the scope of those who can express themselves while also favoring the creation of original associations due in part to the algorithms that facilitate a more fragmented participation.