Map a twitter hash tag to a location.
Look up a location /tag.json?tag=owv09.
Find locations in a bounds /bounds.json?nelat=49.31023929857219&nelon=-122.94919967651367&swlon=-123.24892044067383&swlat=49.28785084331299&callback=jsonp1244416844434&_=1244416845601.