WordPress.com is hugely popular as a Blog host. Simply put, WordPress.com gives free hosting for Blogs using the latest release of the massively popular WordPress GPL software. For those wanting a Blog with a limited set of options then WordPress.com is an excellent choice. People or organizations requiring their own domain name, integration with other software and a huge amount of configuration and extensibility options then a self-hosted solution using software free to download, install and use from WordPress.org is the answer (WordPress.com does provide some upgrade options for various fees).
To most people and organizations, the software or solution used doesn’t matter much as most are concerned with total cost of ownership, reliability (and quality) and meeting requirements. This is precisely the reason that WordPress has done so well; it is simple to use, is equally reliable and feature packed for individuals’ right to the largest organizations and is very cost effective. To illustrate just how popular WordPress is, some statistics are provided below for WordPress.com (WordPress.org stats are not included in the information below):
New WordPress.com Posts per day: 350,000
Total number of WordPress.com Posts: 200,000,000
New Blog comments per day (excluding Spam comments): 400,000
Blogs on WordPress.com: +- 11,500,000 (there are +- 13,800,000 active installations of the WordPress.org software with over 100,000,000 Plugin downloads)
Number of people who visit at least one WordPress.com hosted Blog per month: 260,000,000
Number of WordPress.com hosted Pages viewed per month: 2,000,000,000
Most popular WordPress.com Blog languages: 66% are in English, 8.7% in Spanish, 6.5% in Portuguese and 3.5% in Indonesian.
WordPress.com changes to themes per day: 35,000
Number of Flickr images embedded into a WordPress.com Blog per day: 40,000.
Number of YouTube images embedded into a WordPress.com Blog per day: 50,000.
Number of Photobucket images embedded into a WordPress.com Blog per day: 30,000.