I'm sure there's no harm in trying: <a href="http://ycombinator.com/contact.html" rel="nofollow">http://ycombinator.com/contact.html</a> - whether or not they'll do anything about it is a different question since there are good reasons why they wouldn't want to let people 'revise history' or 'interrupt the conversation' which is more or less what the site seems to be about.