After fairly bad review about Tumblr's availability [1] this was something they needed to write. They had (and still have) pretty big challenges. It's not easy

After fairly bad review about Tumblr's availability [1] this was something they needed to write. They had (and still have) pretty big challenges. It's not easy to scale something like that and this article confirms that. [1] http://news.ycombinator.com/item?id=3468879 http://news.ycombinator.com/item?id=3468879