facebook, myspace, twitter - similar secure internal corporate versions available?
Are there any products that mimic the social networking sites such as Facebook, MySpace and Twitter that are 'private' versions - e.g. the kind that an organization could setup and administer internally. They might use Internet connectivity but basically they would be only for communications between individuals in a corporation or selected third parties? Ditto for internal/'private/secure' wiki and blog management. I know there are products such as Sharepoint but I'm looking for something with the same feel as Facebook and the others I mentioned.
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