Email hn@ycombinator.com, that said I did try that once and nothing happened. But that was long before dang stepped up and took a more active role in moderating threads. Kinda glad it didn't happen because the site's improved a fair bit since then.
I'm kinda a bit like you, I'm really only active online on StackOverflow and here. I have a twitter account but to be honest it's mostly full of re-tweets. I binned Facebook to no great loss, and I broke my mobile phone in January and have never bothered to replace it. I feel I have one foot "off the grid"...baby steps :)
I've tried getting in touch with HN a few times to delete my account. Well, I actually understand the value of keeping the content I've contributed so I really just wanted a name change so my presence was anonymous. Never heard back though.
I'm kinda a bit like you, I'm really only active online on StackOverflow and here. I have a twitter account but to be honest it's mostly full of re-tweets. I binned Facebook to no great loss, and I broke my mobile phone in January and have never bothered to replace it. I feel I have one foot "off the grid"...baby steps :)