Since WordPress 3.3 was released at the end of last year, there have been nearly 12 million downloads and 26.9% of the blogging services sites are using it. So yes, you could confidently say that the blogging service is quite popular.
With a host of plug-ins that allow for customization and a smooth integration with social media sites like Twitter and Flickr, it's no wonder so many people have taken to WordPress. To really detail how much WordPress has grown recently, the folks at Yoast.com put together an infographic using data from Experian Hitwise that displays the staggering amount of traffic and popularity that the service enjoys every single day. After all, there's a reason that WordPress is used by nearly half of the top 100 blogs in the world.