I never got into Vines, personally, but my younger siblings LOVED them and, honestly...there
is a kind of brilliance to setting a scene, establishing a set-up, and executing a joke in 6 seconds flat
Internet humor - especially memes - are significantly self-referential, so often the jokes aren't as funny unless you know that *this* is a reference to *that* which was a spin-off of *that* which was an homage to *this* and on and on. For those following the rapid ebb and flow, you get the thrill of a joke that builds on some inside knowledge (and for everyone else there's KnowYourMeme(dot)com).