Wouldn't that be in Facebook's territory? i.e., "Hey Facebook, I took these pictures at Bob's wedding. Based on the geotag, can you show me other pictures from nearby at the same time?"
It seems convoluted (not to mention a gigantic drag on your battery life) to do so on each and every device in real-time.
It seems convoluted (not to mention a gigantic drag on your battery life) to do so on each and every device in real-time.