Blogs featuring light communication, short entries elaborated with mixed media, little commentary and a stream of consciousness like flow are designated tumblelogs. Rather than longish, editorializing pieces, tumblelogs are catered for quick posts that should be easier to manage; thus we have Tumblr created especially with tumbleloggers in mind.
The upkeep and formatting of blog hosting sites such as WordPress, Blogger, et. al., requires more diligence than Tumblr. Tumblr´s format is perfect for posting discoveries, photos, and swift jottings; keeping things simple, registration is free, and starting a tumblr blog is fantastically easy.
Tumblr.com In Their Own Words
“To make a simple analogy: If blogs are journals, tumblelogs are scrapbooks.
Why Tumblr.com It Might Be A Killer
Tumblr fits perfectly in the space between full fledged blogs featured in TypePad and sites like Twitter; Tumblr´s the happy median. It´s a low maintenance log that is especially great for those who don´t feel the need to rival 19th century Russian novelists.
Some Questions About Tumblr.com
Will some find tumblr too light, too limited. The tumblr tumblelogs featured in the site all have the same formatting which might turn off those who like to have more flexibility. Afterall, regular blogs can be just as short and quick. 
