That it's actually a verb surprises me. I was just intending it to be a pun on the game Frogger. I thought, "one who runs is a runner, so what does Frogger mean?"
If there's one thing I've learned from buying an OED, it's that every damn word in English has an amazing number of variations and meanings.
Some research says that lurkers make up over 90% of online groups. I suspect that Less Wrong has an even higher percentage of lurkers than other online communities.
Please post a comment in this thread saying "Hi." You can say more if you want, but just posting "Hi" is good for a guaranteed free point of karma.
Also see the introduction thread.