Other than outright hacking which was not done in this case, the ONLY successful "prosecutions" I'm aware of remotely resembling this situation are a few cases where someone defamed a (profit-making) company on bulletin boards thus reducing their stock price, etc; they were civil cases and the companies were able to show financial losses because of the postings, etc.
Well, define successful. If the kid or his parents are forced to spend thousands on an attorney, to me, that is some measure of success.