WordPress.com is a free WordPress-powered weblog hosting from company Automattic. It opened to beta testers on August 8, 2005 and opened to the public on November 21, 2005. It runs WordPress MU, a version of the original software that allows people to create and manage their own weblogs without requiring the time, money and technical knowledge involved in setting up WordPress on an ordinary hosting account.
The site was initially launched as an invitation-only service, although at one stage, accounts were also available to users of the Flock web browser. However, accounts can now be registered by anyone, and there are over 1,115,004 accounts with the service. Registration is not required to read or comment on weblogs hosted on the site, except if the blog owner wanted to do so; but registration is required to own or post in a weblog. All the basic and original features (current as of May 2006) of the site are free-to-use, and will remain so in future. However, some new features (such as a CSS editor, domain mapping, and storage upgrades) are available only to users who pay for them.

Features
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Support public blog and private blog (viewer by invitation only)
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offer paid upgrade including features of domain mapping, increase storage and CSS editor function
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About 60 attractive themes to choose from
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support sidebar widget, where you can customize and arrange some themes let you upload your own photo for the header bar
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support global tagging and tag surfer
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built in stats
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easily integrate images from Flickr and Photobucket
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include an inline spell-checker
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provide preview feature that shows you exactly what your post or page will look like before you publish them for the world to see.
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Automatic save feature (it saves your post every minute while you are writing it)
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Got the “page” feature which is not available at Blogger.com. Because of the simple page features, WordPress can be used to manage and built a regular website.
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Automatic Spam protection
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Provide import and export feature, which allows you to import posts from Blogger, TypePad, LiveJournal, and others.
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Support multiple blogs and multiple authors
More about the features of WordPress.com
Learn more about the features which are loved the most by user
Pros
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It’s free
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They take care of blog setup, backup, security and upgrades, so you don’t need any technical knowledge.
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Your posts will be included in the global tag system, where other WordPress.com user can use the same tag to find your blog post. This means extra traffic within a big community.
Cons
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They won’t let you monetize your blog. Although there are news about the future upgrade option that let you display your own ads, but it is yet implemented.
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The number of themes to choose from for your blog are limited.
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Your blog url contains the *.wordpress.com suffix.
If you don’t intend to monetize your blog, WordPress.com is probably the best free hosted platform available now. If making money is one of your goal of active blogging, you should learn how to host your own blog at paid server.
I’ve used Wordpress.com and Blogger.com to blog. My vote is for WordPress.
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