I really wonder why I should search for users in a public forum. Maybe if I’'m new and want to find a forum administrator or if I want to send some nice emails around.
There was a time when more profile fields like Location, Occupation, Homepage and Biography did exist. One may want to search for some of them. Also a XMPP field was available, I’‘m sure that I don’'t want to search for it but to get it displayed either within the profile or on the search result page.
Probably a field / link for the (?)upcoming frappr map (threadID 19754). The Online Users list does contain the country, one may want to search for it.