That I don't know.
All I have is a kluge. I keep a bookmark called "most recent profile:
near top of my menu bar in browser (IE 5)
Right now I have a profile for:
http://www.FreeRepublic.com/perl/profile?u=78799
AKA donnawimmer. From time to time I click on the bookmark, then "move up a couple of numbers" by just editing directly in the address of the browser. Sort of twenty questions - move up 20, get a " No current Freeper by that name", then move down 10, get a "home", move up a half.... If I get a hit and find no profile past it, I then copy that URL into the bookmark using Edit Address function (sorry, not as easy in Netscape).
N. The Know and I got started on this a few weeks ago when we were wondering who the 'latest' was.
Try it below, I will substitute 78800 as latest ID. By the time you get this message, somebody may be home...:)