What is Tumblr?
Tumblr (www.tumblr.com) is a free social media website where a single user account may have several profiles called "blogs," where they can post text, images, videos, links, or quotes, and "reblog" blog posts from other users into their own blogs, optionally appending more content to the original post. Posts can be labelled with tags. Users can like posts and follow other users and tags.