(I'm sorry if this comment gets posted multiple times. My African internet connection really sucks.)
Hi. 25 years old, HIV/AIDS worker in Africa, pro-BDSM sex activist in Chicago. Blog at clarissethorn.wordpress.com.
I very rarely comment because comments here are expected to be very well-thought-out. Stating something quick, on the basis of instinct, or without stating it in perfectly precise language seems to me to be dangerous.
Another reason this site has a higher percentage of lurkers is, obviously, because of the account requirement. There's another related problem, though: there's no way to have followup comments emailed to you. This means that if you really want to participate in the site, you have to be pretty obsessive about checking the site itself. That's annoying unless you are very interested in a very high percentage of the site's output. If, for a given commenter (like me), rationalism is a side interest rather than a major one, then the failure to email comments on posts that I'm interested in -- or even responses to my own comments -- becomes a prohibitive barrier unless I've got an unexpected amount of free time.
Welcome.
You can find follow-ups to your comments by clicking on the red envelope under your karma score. I found out about that by asking-- it isn't what I'd call an intuitive interface.
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.