Tumblr: A blog by any other name is still a blog
I agree with Valleywag. A “Tumblr” is a blog. You are not “Tumblring.” You’re blogging. Tumblr is no different than Blogger, Vox, WordPress, etc.
The only thing that makes Tumblr better than the above services is that it’s easier to update. Right now, it’s the only thing that this service has going for it. The only thing.
It’s a blog service for lazy people.