GNU MediaGoblin is a decentralized and open platform for sharing media stuffs (pictures, videos). It’s a free and open source software, built using free and open technologies such as Python, Celery, SQLALCHEMY, HTML5, CSS3 and so. It’s a GNU project.
MediaGoblin is a decentralized software, you can run your own instance and have full control over it or just use any public instance (run by your friend or someone else). It respects your freedom and independence, so it’s a great alternative to sites such as Flickr. It has simple and clean design with features you will love to use. (e.g Markdown support, easy conversation/discussion on your photos, public profile etc)