There have been critiques of the social network analysis approach. I would say that there is enough converging evidence that do influence each other to basically say, look, let's assume that there is some prediction going on and then try to unpack it. And i know that some of the cristachus research has been challenged as well in arguing that he and his colleagues may be conflete a variety of issues that should be considered separate.
Also: which professions have the happiest people?