I worry a bit about mob rule. Not a lot - just a little.
There is huge potential to "mobilise" vast numbers of people around a particular idea or opinion in tools like Twitter. While mostly a good thing this can also turn ugly. It can easily turn into a mob and as with any mob damage can be done and people can be hurt if too many get swept up in the crowd.
However we can all play our part in putting the brakes on. Most of us who have been blogging for any length of time learn that moment when you decide whether to amplify a weak signal or turn down the volume. The decision that even if something is noteworthy you won't fan the flames.
I am optimistic that once more people learn to recognise this moment and apply it to the newer tools like Twitter we will probably manage to stay on an even keel.