Photo sharing websites have been around since the 90s, but it took a small startup site called Flickr (now owned by Yahoo) to catapult the idea of “sharing” into a full blown online community. Flickr uses "tags" or what we would call keywords to help identify and search for photos. Take the Flickr Tour. Do this by clicking on each number across the top of the page to get an explanation of the 8 parts of the tour.