Tumblr is a free microblogging platform and social networking website that allows users to post text, images, videos, links, quotes and audio to their tumblelog, a short-form blog. Users can follow other users, and 'reblog' their posts, or choose to make their tumblelog private. The service emphasizes ease of use. Tumblr is feature rich and offers professional and fully customizable templates, bookmarklets, photos, mobile apps, and social networking.