“Hey! You in the bushes! Come on out!”
Quoting him: “If you don’t know, a lurker is someone who visits blogs without ever commenting on it. So if you’re stopping by, say hello. Leave a comment and tell me I’m an idiot. Tell me I’m a genius. Whatever. If you have left comments before, do it again. What will it cost you? I would do it at your blog! Really, I would!” And I WOULD.
(Intentionally postdated for maximum short-term effect.)