Disclaimer
While social network analysis is a powerful tool, it is not more than a tool: SNA will not give you solutions on its own.
It is a great tool to use alongside other tools, such as follow-up interviews, but you should not rely solely on your findings from an SNA study. In particular, social network analysis is good for highlighting and pinpointing problems. All studies should be understood in the context that the data is gathered in: current situation of the company, the number of people included, and whom the study has covered.