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WetPaint , a popular hosted Wiki solution, announced this week that they are to provide person-to-person and private messaging between users of their Wiki network. This means that Wetpaint Wiki users can now send single or multi-person private messages, to connect and collaborate with others about their interests. On reading this news, it got me thinking about Wikis - or more to the point, who is using them and for what purpose . Firstly, I'll briefly describe wikis and then we'll explore the range of wiki products in the market right now. What is a Wiki and where did they come from? A Wiki can be described as a website that allows visitors to add, remove, edit and change its content.