This is very good. I would add: the world was not ready for Vine. The amount of content, the type of it, and the number of people out there willing to make go

This is very good. I would add: the world was not ready for Vine. The amount of content, the type of it, and the number of people out there willing to make goofy content - I mean young and old alike ... is amazing. The number of people with cellphones and decent cameras recording 'everything' means we now have all sorts of vidoes of 'guy fishing and whale breaches' or literal lighting strikes etc.. And the normalization of content creation, of likes, of views, the possibility of making money from it etc.. Basically the tools, cultural norms, media and social systems - all reached a critical mass some time after Vine. If Vine were to have held on, evolved along the lines you indicated, they might have beak TikTok to it. Oh - and one last point: TikTok started with cute dancing girls among teens. That content category is a great place to start, break through, and get a critical mass going before breaking into parrots swearing, cute babies, and funny challenges.