Tom Cheshire’s article How Tumblr’s David Karp built a £500 million empire is a good retrospective of how my favorite blogging platform grew to have more page views than Wikipedia or Twitter.
Having raved about and avidly used Tumblr since it first appeared, I can say he gets the facts right, as I know them, while telling me more I didn’t know about the history of a favorite internet startup.
If you don’t know, Tumblr is still the easiest way I know of for anyone to blog.