Proof of brain is being proven effective by the Hive experiment, pretty much. Hive and other blockchains (BAT comes to mind) are showing so effectively that when you distribute the revenue from a social network to the participants, rather than to the owners of the business that runs the network, it allows for a much better set of incentives where far more people can win.
And when more win, moer stability comes, as they build wide and solid, as well as being connected.
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