Search returns only people results, not plurk results.

I'm trying to use the search function to find a particular plurk from one of my Friends. The box says "find your friends & plurks", which I assume means nick names and plurks and responses will be search. Please correct me if I'm wrong. The results of my searches, however, are always people only.

Is anyone else having this problem? Is there maybe a separate search page that I haven't found yet?