A site where people upload their photos. The photo EXIF data would be used to tag it to a time and place. The site would then allow people to search for photos based on time and place. So, if you go to a concert or sporting event, you could get photos other people took from the same event. You could also get pics from a party or wedding you were at. There would have to be some level of permissions for sharing but ideally the site would encourage sharing with the public for non-personal events.