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Dating apps were mainstream long before 4chan existed, although not as dominant. The idea that all of the women go for the top tier of men gained prominence with an analysis posted on the old OKCupid of their user behavior, and the particular 80/20 split was just pulled out of somewhere, likely borrowed from the Pareto Principle. In any case, 4chan may have pathologized it, but certainly did not originate the notion.