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Not really care for, but the number of relationships you can keep track of:

"By using the average human brain size and extrapolating from the results of primates, he proposed that humans can comfortably maintain 150 stable relationships."

https://en.wikipedia.org/wiki/Dunbar%27s_number



That's what I meant to say. FB friends = friends + acquaintances, which should be around 150 for average people




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