Tumblr is a re-envisioning of tumblelogging, a subset of blogging that uses quick, mixed-media posts. The service hopes to do for the tumblelog what services like LiveJournal and Blogger did for the blog. The difference is that its extreme simplicity…
Tumblr lets users effortlessly share anything. Post text, photos, quotes, links, music, and videos, from their browser, phone, desktop, email, or wherever they happen to be. Users can customize everything, from colors, to their theme's HTML.
Tumblr launched in 2007 and is headquartered in New York city.