I recommend exploring some of the primary graph database resources that offer a wide range of datasets for social network analysis. The Stanford Network Analysis Project (SNAP) hosts a diverse collection of datasets from various social networks, which can be found at http://snap.stanford.edu. Additionally, Gephi, an open-source network visualization tool, provides datasets that are particularly useful for visual analysis and can be accessed through their GitHub repository at https://github.com/gephi/gephi/wiki/Datasets. These resources should be valuable for your decision-making research in social network analysis.