Despite the widely held notion that processes of radicalization tend to happen in relation to others, systematic evidence on the social context in which actors meet and form ties is scarce. This is problematic, as without a more thorough understanding of the relational dimension of radicalization, any strategy to intervene may turn out less effective than perhaps hoped for. Based on our access to detailed police information on eleven Dutch Salafi-Jihadi networks (2001–2014; 273 actors), this article presents a descriptive analysis of the social context in which actors meet and form ties. In most networks, we observe pre-existing family and friendship ties, actors to frequent Salafi mosques and radicalizing settings, and committed actors engaged in functional roles. We also find indications for these elements to facilitate actors to form ties. It is important to note however that we also observe exceptions, both in terms of prevalence and impact of the relational factors we study. In the article, we describe our detailed empirical findings and reflect on the (differential) social context is which actors participating in Dutch Salafi-Jihadi networks meet and form ties.