Flickr is a photo sharing website launched in 2004 by founders Caterina Fake and Stewart Butterfield. It allows users to upload and share photos for free. Flickr makes money through advertising on its site, with advertisers paying per click. The website aims to make sharing photos with friends and family easier by creating profiles and applications for mobile devices. While free for users, Flickr faces privacy issues around other users obtaining and posting pictures without permission. It was briefly blocked in the UAE due to sexually explicit photos hosted on the site.