Ask HN: Review my prototype - http://cluud.in - real time local search for SF

To scratch an itch, I built this prototype (http://cluud.in) for a local search system that leverages twitter. It allows you to follow "locations", rather than trends or users, like twitter and other services currently offer. What do you think - the design, idea et al? and what would make it more useful and make you come back to use it?