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Using AROUNDMe collaboration server you can create multiple collaborative group, webspace, community or social networking websites. Each group can create a multiple page collaborative web site. They get social tools such as a guestbook (a wall), a group blog, a forum and a wiki which they can drop into web pages. Each group is fully customisable using xHTML, CSS, Javascript and PHP. Groups can be private or public.
NB: this is a couple of years old and doesn't appear to be under development anymore.