Also, in defense of the police, I would add that extricating victims from car wrecks frequently takes upward of two hours. It is common that accident victims don't die on-scene, but shortly after in transport or at the hospital. At least in the US, hospitals are ranked partly based on the level of traumatic injuries they accept, so patients aren't always taken to their community facility. We routinely get patients flown in from rural areas, over an hour away by air.
It could easily be that it took two hours to get him out of the car, and two hours for the local police to drive to the hospital where he was taken. Then another hour once they were there to deal with an unfamiliar place at three in the morning, and to locate a patient who might be registered as Doe, John #7820501 and remembered by the staff just as, "one of the kids from an MVA last night." That's five hours just to track him down, forget identifying someone who, between the scene and the hospital had all his clothes and personal effects removed, and then get back in touch with their local department so that they can begin to locate next of kin.
I know this wasn't exactly the point of this thread, and I am happy to see that many others have made similar arguments, but working in an ER, I find that most people base their ideas of hospitals off TV shows, which are accurate only in that they are also set in a building with "Hospital" on the front. TV shows neatly wrap of several cases in 42 minutes, all while saving time for someone to have sex in a closet, seated group meals in quaint locations, and a hug from their new patient friend. In reality, 42 minutes might not even get a patient stabilized much less through surgery, there is no unoccupied place to have sex, you can eat if it fits in your pocket, and that patient was much more likely to bite you.
That said, it should occur to all of the kids at the accident scene, who are the only ones to know at three in the morning, that maybe the victims' other friends and relatives don't need to find out on facebook. If they are genuinely too traumatized to consider this, I cannot imagine posting on facebook is their first impulse. To me, it sounds like a case of the I-knew-firsts, which is always crass, and in this case very inconsiderate.