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. •Trust multiplicity and network heterogeneity characterize emerging markets.•In emerging markets individuals rely on ambivalent trust ties.•Nonspecific trust emerges once opportunities to collaborate with remote others are given.•The boundary spanning function of non-specific trust leads to increases in overall trust levels.