Trust me on this one.

an online/offline trail of breadcrumbs noticed, seen, read, heard, picked up, picked on, picked over by jorge.mourinha@gmail.com

The comment space is a whiteboard where others are able to expand on ideas or opinions on whatever topic is at hand. This is an understatement, of course, because as everyone that has ever visited a site with the ability to comment knows, they are often abused.
John Carey explains why you shouldn’t Drive Angry over at Fifty Foot Shadows. And he has a point.