The open source blog tool and publishing platform WordPress now hosts more than 50 million websites, half of which are hosted on WordPress.com, according to WordPress’ official statistics. Very Impressive, I Must Say! Keeping in mind that these stats are for WordPress.com only, not including all of the activity on self-hosted blogs.
Moreover, over 283 million people view more than 2.5 billion pages each month on WordPress.com, while users publish about 500,000 new posts and 400,000 new comments on an average day.
If we consider other personal, business and community websites + the self hosted blogs, these figures would go well above this.