CMS, social, and enterprise portals are all vying for position as a one-stop solution, but most only solve one angle: a CMS doesn't typically fit well as a social analogy, and social platforms don't typically work well as a complete CMS. Traditionally, neither is geared for custom development or multi-system integration like a true horizontal portal, which can be difficult to master. Liferay, on the other hand, is built from the ground up as an enterprise-grade integration framework, plus it includes intuitive and easy-to-use CMS, social/collaboration, and document management features, all tightly coupled on the backend and purpose-built for customization - anywhere you require it.
With Liferay you get the most flexible customization capabilities of any horizontal enterprise portal framework: while most frameworks limit you to API integration, with Liferay you get the source code and can override any part of the framework to achieve a custom result. That's true, open, flexibility. That's Liferay.
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