In spite of an increasing interest for how ICTs entwine with collective participation dynamics, the ways in which their relational and communicational potential is exploited by extreme right organizations remain overlooked. In this article, we aim at moving forward along this research avenue by focusing on how extreme right organizations and groups employ digital communications to sustain the construction of «inconvenient solidarities», i.e., systems of relations amongst actors that oppose and distort current efforts of transnational democratization – particularly at the European level. By focusing on the websites of extreme right organizations in six European countries (Austria, France, Germany, Italy, Spain and the United Kingdom) and by making a combined use of digital research tools and social network analysis, we explore how these organizations make a strategic use of ICTs to connect in the online space and the arguments they move forward to criticize and reform current projects of European integration. Our results suggest that ICTs sustain the construction of inconvenient solidarities in heterogeneous ways, supporting different modes of online conversations amongst extreme right websites which, in turn, affect their capacity to propose shared critiques and proposals to reform the European Union.