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I think what he's getting at is that Facebook's path became clear as soon as: 1. the reciprocity effect started (photo-tagging) and then; 2. social validation

I think what he's getting at is that Facebook's path became clear as soon as: 1. the reciprocity effect started (photo-tagging) and then; 2. social validation started (the like button)

sneakernets 8y ago
That was always there anyway, but the like button made it that much easier to validate.