The study examines the segregation of different marginalized social groups – ex-prisoners, gypsies, gays and lesbians, homeless people – and their visibility in society. Using a size generator network method, the study builds negative binomial models to compare the segregation of marginalized groups within a representative sample of 1000 people. The alpha value in these models indicates the level of overdispersion. According to the results, the level of segregation varies between the overall network and the trust network. Specifically, the level of segregation for gypsies is the lowest in the overall network, whereas in the trust network, it is the lowest for gays/lesbians. The segregation of homeless people is extremely high, which is due to the fact that they are confined to their own space. Individuals with low education, belonging to lower classes, living in villages have the smallest network size. However, they have the highest number of marginalized social group members. A smaller network is associated with lower levels of peer support. The lack of weak bonds makes the social network homophilic and „island-like” social exlusions are formed where poverty and vulnerability are typical.