Not easily. A search engine, site specific search might do it but the more active you are the less accurate the results. You could also use site search.
That said, those kinds of posts really aren't allowed, so they will often get moderated. The most common place for them to appear are on your notes though.
Where on the site can a person find the comments others make about him/her? I get messages of course, but is there a separate place where people are saying things like "loser", "uses an engine", "avoid this person"- you know, that kind of stuff?