Liferay Portal provide you enterprise web based solutions. Collaborative websites for teams and an entire enterprise are developed with the help of portals.
Using liferay authorizing teams individuals can create their own communities,creating a web area assigning a set of collaborative tools (blog, wiki, calendar, tasks, alerts, doc sharing, etc.) through the portal to the group. All collaborations within that community can be created by an individual to which he can join and organize as well.