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In the 1910s, propagandists would send push-surveys that included a question "(who else/what other organisation) do you know who should get this survey?" in order to map out socio-political graphs and plan their campaigns.

HREFs sound like much less manual work.

Edit: > ...able to find similarities even among websites that Marginalia doesn't index

Yeah, I joined LinkedIn specifically because even without my input it was way too good at figuring out my actual social graph. With my input, it no longer is :)

Lagniappe: https://www.tandfonline.com/na101/home/literatum/publisher/t...