A couple of weeks ago, I taught a class for Book Publishers Northwest called Tweet On: How to Use (And Not Abuse) Twitter to Build Your Platform and Sell Your Books. It was a fun evening, despite (or perhaps because) I don’t currently have a projector that works with my laptop, and so was reduced to drawing the Twitter homepage on a white board:

The Twitter homepage, whiteboard style

There was one attendee, though, who was not impressed. He announced that he was skeptical of this “social medi...