Definitely has a real Mad Max feel to it and an interesting enhancement of the Flash Mob meme. I can see a variant emerging where instead of hanging out in one spot, they zoom around the city getting in hit & run crashes, along with running cars through the entrances and display windows of stores to allow looters to follow them in.
Apparently so far the Gestapo hasn't found a good way to combat this phenomena. I'm sure the carz are all stolen, and as soon as the cops start to arrive the drivers and riders ditch the car and blend in with the spectators. If they aren't idiots and wear gloves, no fingerprints and unless their DNA is on file stray hairs won't locate them either.
Not sure how widespread this action is yet. It has a definite CA feel to it, I could see the Beach Boys or Jan & Dean writing a song about it. It definitely will get a movie.
RE