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Re:HN: Share an unused idea by sharadgopal on Saturday October 09, 2010 @08:42AM (#1774915)
http://groupspaces.com/ does most of what you mention.
Re:HN: Share an unused idea by sirwitti on Saturday October 09, 2010 @11:15AM (#1775120)
thanks for the link! i didn´t know it yet though i researched a while on the topic. :)