A milieu is the unique, ever-shifting configuration of information flows, people, and ideas that you are exposed to and that, in turn, shape you.
It is visualized as a directed graph (graph theory) where its nodes are its people, objects, and ideas and the connections between them.
Unlike the word “culture"", as anthropologists use when talking about “French culture” or “Balinese culture”, a milieu is not a monolithic thing. Your milieu is not the same as your sister’s. It is an ever-shifting, individual configuration of information flows. The Twitter feed you have curated is a milieu. Your friend group (which is not the same as the friend groups of the other people in that group!) is a milieu. - Henrik Karlsson
Unfolding with Context, Networked thought, Convergence and Divergence