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> A social network at the end of the day is literally just that: a graph of people (nodes) with relationships (edges) between them.

Doesn't sound like a very useful definition. There are infinite meaningless graphs of people that fit your definition. E.g.: the graph were the relationship is "all of our grand-grand-parents have the same number of characters in their respective names". There you go: graph of people (nodes) with relationships (edges) between them.




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