Recently a study was released by Pingdom regarding the content management systems (CMS) used by the web’s top blogs and, perhaps not surprisingly, almost half of those sites were powered by WordPress. 48 of the top 100 are using WordPress as their backend system, while Movable Type, the second most used CMS, powers only 7 of the top 100 blogs.
To break the numbers down a bit further, 39 sites were using WordPress and an additional 9 were hosted by WordPress. In addition, 12 sites used their own custom CMS, Typepad accounted for 8 blogs, and at the bottom end, one was using Tumblr and one was on Diderot. Gawker sites all run on their own custom software and counts under “Gawker” as opposed to “Custom”. There is a smattering of Blogger, Drupal, BlogSmith, and others, while 8 blogs declined to answer. You can check out the chart below to see the full breakdown.