It's easy on Lesswrong in particular by just clicking on your name link, so I can see you've been pitching in on the thread "Another "LessWrongers are crazy" article - this time on Slate", and I think the record goes back years -- probably since you've been a member. If

It easy to get a list of all posts. It's not easy to automatically search with them in a way that distinguishes between a person having said something himself and a person who responds to them having said something.