[briantrice]

You should be aware that there was a site like this in 2006 called Standpoint, partly by Gentry Underwood of Mailbox. It also allowed for structural replies and disagreements. References were also included which would point to web articles or books on Amazon, etc. They never developed a proper business model and shut it down after a year. Personally, I wanted to transform/replace blog commenting with this, but it was too big an endeavor to see through.