The International Social Survey Program (ISSP) is a long-term international research project that has existed since 1983. This research project is based on international and cross-project collaboration in social research. It focuses on attitudes towards important societal issues. ISSP combines two levels of comparison - a comparison in an international and a time perspective. Research activities are carried out continuously in annual cycles. The topics of Social Networks has been studied three times since the existence of the ISSP: in 1986, 2001 and 2017. The latest module has slightly changed its name to "Social Networks and Social Resources". Investigations are always partly a replication of previous studies. ISSP Social Networks modules essentially deal with issues, such as nature and contacts with family members and friends, participation in associations and groups, duties and rights in social networks and social trust.