With Instagram's new App update, the "find your friends" on Twitter is very obviously missing. This is due to restrictions from Twitter's side, and seems to be a snub in Instagram's direction as many apps like Foursquare still have access to this part of the API.
As we have noted, FourSquare has become an extremely popular way to share where you are. However, unlike yesterday's hot location-sharing app, BrightKite, FourSquare does not have the ability to share photos. Is this an oversight, or is it an opportunity to fill a void?