Yeah, that's what I meant by "nexuses like that" but see now I left unstated "everywhere"/"in every area". Politics is an obvious one, since we see them campaig

Yeah, that's what I meant by "nexuses like that" but see now I left unstated "everywhere"/"in every area". Politics is an obvious one, since we see them campaigning and talking to lots of people, but trade shows, professional associations, parties, jobs, incidental effects of jobs (talking to reporters who talk to "everyone") all tend to connect a lot of people to a smaller set of far better connected people.