That's a pretty cool idea. A web-of-trust problem would have to be solved: the various systems that connect to the system would need to trust each other's inter

That's a pretty cool idea. A web-of-trust problem would have to be solved: the various systems that connect to the system would need to trust each other's internal reputation systems. You'd have to prevent people from inflating their total reputation by using a single site with an easy-to-game reputation system. Some interesting challenges in there :)