think long hair as counter cultural act of rebellion, spreads from california (or wherever) to east coast, thence to europe, but mutates as countercultural elements become mainstream, you end up with burt reynolds in a mullet, meanwhile it also mutates into spiky hair in punk, and post punk fractures to all sorts, weird flock of sea gulls curtains etc. More recently with ideas flying over social media, forums etc this can be something like the downfall with alternate subtitles, copied, then parodiedetc (though the concept was probably nicked of something else), or "your bases are belong to us" from original in game weirdness to in-joke to a sort of badge of geekdome. I guess it also covers things like the ice-bucket challenge or the #3positivethings, though they're more viral marketing, but share properties i guess. I guess analogously the internet is more like th edeep rainforests where genetic markers spring up and dissappear rapidly in aplace of high fertility and competition.