Drupal is one of the rare platforms for building social publishing applications that is built on top of a rather decent WCM platform. It has a  strong foundation with a very flexible taxonomy system which along with thousands of 3rd party modules enables you to assemble social publishing applications.
However, these modules could be your biggest problem [...]

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If you have a site or blog and you wanted to make it a community site, your options were limited. Building features like invite a friend, social networking and collaboration was not trivial and involves writing your own applications - this may or may not be supported by the hosting provider unless you were using [...]

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