As of today, one in every four websites is now powered by WordPress.

The open-source content management system (CMS) now powers 25 percent of the Web.

This is according to the latest data from W3Techs, which measures both usage and market share:

“WordPress is used by 58.7% of all the websites whose content management system we know. This is 25.0% of all websites.”

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While these numbers naturally fluctuate over the course of the month, the general trend for WordPress has been slow but steady growth.

“We should be comfortably past 25% by the end of the year, ” Automattic founder Matt Mullenweg declared.

Matt said that the big opportunity is still the 57% of websites that don’t use any identifiable CMS yet, and that’s where he thinks there is still a ton of growth for CMS.

[Via VB]