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Gunnar_Zarncke comments on [link] Large Social Networks can be Targeted for Viral Marketing with Small Seed Sets - Less Wrong Discussion
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Apparently they do. The study references e.g. “The Spread of Behavior in an Online Social Network Experiment,” which is an controlled social network of real humans exhibiting basically this behavior:
First, it's an artificial, experimental network of real humans. Second, the adoption rates in that study top out at 50-60%. The paper in the OP concerned itself with finding a seed set which will produce a 100% adoption.
For real human of course you need a more detailed model than the simple linear threadshold one which was amenable to optimization by their algorithm. With a more detailed model they probably wouldn't have been able to reach 100% but wouldn't have tried to (e.g. if there is a non-adaption term I'd have strived for 100% divided by the non-adaption rate or something). But that doesn't mean that you can tipp tippable populations.