Tumblr is a microblogging platform and social networking website founded by David Karp in 2007, and owned by Yahoo! since 2013. The service allows users to post multimedia and other content to a short-form blog. Users can follow other users' blogs, as well as make their blogs private. [source]
How to download videos from Tumblr
1. Copy a supported Tumblr url from your browsers address bar (see above for some examples).
2. Paste the url into the box above and click the Download button.
3. A list with several download links will appear. Each link represents a different video quality.
4. Choose a quality and click the download link.