From the recent State of the Word keynote given by WordPress founder Matt Mullenweg:
This has been an exciting year for WordPress. We’ve grown to power 14.7% of the top million websites in the world, up from 8.5%, and the latest data show 22 out of every 100 new active domains in the US are running WordPress.
THEOKNOWS.com is powered by WordPress and has been for about 3 years now. If you’ve ever used the software, you know why. It’s powerful. It’s flexible. It’s incredibly easy to use and customize.