SharePoint, and in particulair MOSS, is a great platform which can be easiliy extended. Most customers today are afraid when we talk about customizing a platform because development normally means not reaching any deadlines what so ever. I have noticed with SharePoint this is not always the case because of the powerfull API and the fact that you can setup and develop stuff very quickly.
Microsoft leaves extending the platform to its partners and other third-party vendors. Third-parties like SocialText have created a cool extension / application on SharePoint called Social Enterprise Wiki.
As they stated on their website:
"With Socialtext SocialPoint, Socialtext delivers key wiki features for easily editing pages, adding comments and tags, creating links, embedding images and attachments, as well as setting permissions by user or groups for the wiki workspaces. By working with Sharepoint and Active Directory, Socialpoint provides single sign-on access to multiple wikis, as well as integrates with existing Microsoft Office documents stored in Sharepoint through links.
Users can easily draft content in the wiki, gather collaborative feedback from team members, and then publish a final version of this wiki content as a Microsoft Word document that can be stored inside of Sharepoint. The SocialPoint integration also provides summary views of wiki content, such as 'What's New' and 'Watchlist' items, to be displayed directly inside the Sharepoint portal for a unified user experience.
SocialPoint supports both Microsoft Office Sharepoint Server 2003 and Microsoft Sharepoint 2007."
The product delivers some great things like:
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Wiki collaboration
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Team weblog publishing
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Integration with email, IM and more
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Advanced search & tagging
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Integration with network & directory
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more....
Social Enterprise Wiki is a great example of how Wiki can be used as a Social Networking platform / tool. Integration with personalisation and presence makes it complete! They also deliver an open source platform to give others the possibility to extend their current products.