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When you kick off somebody who draws in a huge number of eyeballs for advertising, there is far more than mere rational market forces at work.
P.S. Alas I don't know of a good solutions, only a couple bad solutions that may or may not be good enough: (1) decentralized social ntworks, which being open source tend to be user hostile (2) laws protecting property rights in the investments of social ntwrk users
