Facebook lacks a simple feature
How do you search for all of your friends that are from or in a specific location (e.g. all my friends in Namibia right now)?
Sounds like a simple enough search.
Or is this feature already implemented?
It’s not linked to from the front-page – only when you do a search: http://www.facebook.com/advanced.php
And as a commenter pointed out, http://www.facebook.com/advanced.php doesn’t exist anymore!