The Publisher: Matt Mullenweg

Wordpress.org

As the importance of social media expands, so does the influence of WordPress, the blogging service that most serious bloggers turn to. And though blogging might seem well established, WordPress just keeps on growing. Open source software is part of the reason for WordPress' success. When Mullenweg started blogging in 2001, he used open source software to develop his own Web tools, which became WordPress. Traffic to WordPress' service more than doubled during the last year to 103 million global visitors, compared with main rival Typepad's 20 million.

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