Where blogs covering topics including technology, design and startups are ranked according to their influence.
Each blog is represented by a leaf on the tree, with the leaf's height corresponding to its sphere of influence, as scored by BlogLevel. Scores are out of a theoretical maximum of 100.
The colour of a leaf denotes the respective blog's subject-matter, where categories include PR, Social, SEO and Startup.
As the graphic shows, Smarta ranks highest with a score of 59.9, ahead of Jim's Marketing Blog in second place and We Are Social in third.