Hugh over at The Gaping Void sums up advertising pretty succinctly. Seth Godin keyed on the same drawing and points out that you can substitute lots of words (i.e., “customer service”) for “advertising” in the picture above and sums it up by saying/asking:
The next time you get all formal or obfuscatory or snarky, ask a simple question, "If I knew this person and we were eating together in a restaurant, would I speak to them the same way?"
Link — Seth Godin
Link — Gaping Void