In the way that the Internet was meant to be a place you could go that would be free of laws, since any action there has very few consequences in the real world. Perhaps that's changed over recent years, but it doesn't mean that it's suddenly fine to realize big brother. I mean, monitoring Facebook messages and BBM? Does that not strike you as a huge invasion of privacy? As i see it the Internet is the modern day equivalent of Venetian masked balls.
As for those who created events with intent to incite riot, i think the fact that they were publicly available changes things somewhat, but the fact that they actually did have no consequences in the real world should be taken into account - being an idiot on the internet isn't really the same as being an idiot in real life.
Perhaps that boils down to the even larger problem of pre-crime...