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"Shake"? You mean "bump" don't you? This has been tried numerous times before ... https://thenextweb.com/apps/2011/01/23/5-mobile-apps-that-could-kill-busines

• toyg 6y ago
  Bump had bootstrapping problems (if I have it but you don't, it's useless), and it was also not particularly reliable at the time because of hardware quality. To be clear: I don't think this sort of thing alone is enough to bootstrap on its own in a market with established social networks, but I don't understand why such social networks don't offer it as a feature.