In an increasingly connected world, the internet serves as the main source of political information, which harbours both opportunities and threats for democracy. While digitalization promotes the democratization of political discourse through low barriers to entry and a greater diversity of topics, concerns are raised about the promotion of segmentation and polarization that could threaten social cohesion. This article examines the fragmentation of online political media content consumption by comparing different political-communicative milieus and analysing their participation in online communication. The analysis of online information use by different political-communicative milieus shows a social fragmentation into online and offline information consumers, with the “Critically Involved” showing intensive use of various online sources, which strengthens their democratic participation. In contrast, the “Authority-oriented Non-Involved” and the “Competition-Oriented Right” use online information selectively, leading to increased compartmentalization and a lack of democratic discourse. This emphasizes the need to monitor online public fragmentation and strengthen political journalism in order to strengthen democracy.