Instagram's search-by-geo-coordinates endpoint is one feature that makes the API so valuable and interesting...Other services have it, of course, but Instagram's version has higher value because geolocation is turned on by default...I read somewhere that maybe 2-5% of Tweets have geodata, whereas Instagram content is at 30 to 50%.<p>The investigative newsroom ProPublica (disclosure: my former employer) had a fun use-case, in which they knew of a lobbyist-politician ski resort retreat, looked up the location of the resort, and then used Instagram's location/date filters to see who was on the trip (at least one lobbyist posted a photo from their own publicly identifiable account): <a href="http://www.propublica.org/nerds/item/a-super-simple-tool-to-search-instagram-by-time-and-location" rel="nofollow">http://www.propublica.org/nerds/item/a-super-simple-tool-to-...</a>