Interesting idea. Perhaps there should be some guidelines. I'm not sure your average road-rager would respond well to being reported in the manner of some of these reports; it would likely just increase his deep sense of the-world-has-cheated-me resentment. Maybe accurate reporting should be encouraged, and a bit less self-indulgent, self-righteous ranting.
And there are two sides to every story. I have a friend who considers a lane-change with anything less than about 150 feet of room in front of the overtaken car a cutting-off incident. And there are a lot of people here in Massachusetts who haven't learned the esoteric skill of using a turn signal, and then flip the bird to anyone who incorrectly anticipates their next moves.
A good motivator to driving courteously and attentively is to cultivate the habit of asking yourself, whenever someone pisses you off, "Have I ever done that?" and "Have I done that repeatedly?" After a while, the awareness of your own inconsiderate acts begins to coincide with the occasions when you perform them, and the resulting feeling of sheepish "oops" starts to have an effect. (That is, if you have any sensitivity to discovering your own little hypocrisies or, to put it more tactfully, your own failures to behave according to the ideals you want others to observe).
And, hey, merry Christmas!