The contemporary proliferation of “filter bubbles” and “echo chambers” seems to render obsolete the notion of a public sphere in the singular. In my article, I would like to argue against this view: Following Jürgen Habermas, “the public sphere” can be understood as the concomitant horizon of communicative action, while the latter permeates society as a whole. On the basis of this socio-philosophical approach, the omnipresent tendencies toward fragmentation appear as reactive attempts to ward off this socially established and context-transcending (...) context of discussion. Habermas himself, however, has never adopted this perspective. Instead, he interprets the various symptoms of the decline of the public sphere—including its fragmentation—as the result of a “colonization of the lifeworld” by economic, bureaucratic, and technological system logics. However, on the basis of the concept of “systematically distorted communication,” which was still crucial for Habermas’s early work, it is possible to reconstruct how the lifeworld context of communicative action, out of which the public sphere emerges, is not only corroded and cut through from the outside by system logics but also exhibits its own dialectic of the refusal of discourse and the overcoming of this refusal. The fragmentation of the public sphere that we are confronted with today can be theoretically interpreted and politically addressed as a precarious standstill of this dialectic. (shrink)