The nature of informal networks in various societies, and particularly whether they recede or tend to persist over time, has long been a subject of discussion in international business studies. However, empirical research on trust in network-oriented societies, where individuals typically maintain somewhat different relationships with their in-group, out-group, and non-specified others, remains limited. Drawing on insights from informal network research and intergroup contact theory to model trust relationships in network societies, 882 respondents from three network societies -- China, Russia, and South Korea -- were surveyed, and confirmatory factor and path analyses applied. The results suggest that as network importance increases, both in-group trust and out-group trust also increase. Individuals who more commonly draw upon out-group trust ties attach less importance to in-group trust ties. Increases in non-specific trust, however, are associated with increases in both in-group and out-group trust, pointing towards the boundary spanning function of non-specific trust. Consequently, rather than finding a clear indication of whether informal networks persist or recede, ambivalent trust relationships were observed. This calls for a reexamination of the conventional ‘either/or’ perspective on the nature of informal networks. This network heterogeneity can be attributed to individuals, especially in developing network societies, utilizing a ‘both/and’ approach to trust and networking, and yielding more economic opportunities.