I definitely feel there is a difference between a RUNNER and a JOGGER. With that being said, we can't knock others for not being able to tell the difference, but I believe there are several subtle clues if one was looking for them. If someone is running with a GPS watch, decked out in dri-fit (specifically event shirts), chances are: RUNNER. Someone in sweat pants and non-running shoes: JOGGER.
People will often say speed is a way to determine the difference, but I believe speed is too relative. Olympic marathoners run 6 min miles which make my 9 min miles slow. As Mr. Schorr (a Facebook friend) said, there are senior runners that may take 7 hours to run a race. I also would not classify them as joggers, they're just plotting along at a different pace covering similar distances.
So after some great insight from you all, including my former college roommate who introduced speed-walking into the conversation (but that may require a Pt. III), I truly believethe difference between a RUNNER and a JOGGER is purpose. (which seems to be on par with the comments from Pt. I) We runners, usually run for a reason like an event coming up or to keep our sanity. We are addicted to it and set out to run X miles on a given day aimed at finishing or improving on a time goal. A jogger may hit the pavement at the same pace, but doesn't do it for the same reasons. We have a passion behind it that is usually directed at achieving something. You won't find a jogger out on the road for a couple hours, whereas for us runners, that's a great start to a long run. Our intent could be a number of things such as to beat a PR, to complete an event or to attain peace of mind for non-event runners. Erin (a Facebook friend) may have put it best, simply stating: a jogger is the casual version of a runner.
Runner, jogger, sprinter, marathoner... toe-may-to, toe-ma-to.
(just don't call me a jogger)
— I'm only half-serious on that one and typed it smiling.