I think a big part of the evidence is the speed at which Snapchat grew among its audience. As well as other new mobile paradigms. But as you say that could just be confirmation bias! Here is a post I wrote a few years about why I think mobile and touch are different than some of the other UI paradigms that haven’t exploded yet: https://techcrunch.com/2013/09/29/generation-touch-will-redraw-consumer-tech/

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