Love checking replies and comments under viral content because 90% of the time you'll find a post credibly correcting/debunking the original thing and it just... doesn't matter. It doesn't slow down one bit. Stories spread faster than facts.
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What can possibly come after an engine that feeds on collective, instinctual action?
Someone will make many billion dollars finding out. I would expect advancements in AI to play a leading role. But who knows really. 
