I'm not so sure. Privacy is a big deal for me, but I'd sign up to something like this. If: If it uses a mechanism like CardSpace (http://en.wikipedia.org/wiki/

I'm not so sure. Privacy is a big deal for me, but I'd sign up to something like this. If: If it uses a mechanism like CardSpace (http://en.wikipedia.org/wiki/Windows_CardSpace http://en.wikipedia.org/wiki/Windows_CardSpace) had: => I own my own data (client-side encryption on my client) => I consent to others accessing my reputation. Note that access means others can see, not get a copy of, and not keep. => I can withhold my reputation completely, or delete it at will. In such a world, as Airbnb for example, I might make it easier for someone willing to share their reputation to rent a room. A non-existing or withheld reputation might require other checks (like a credit check), or verifiable references, for instance. If thought through this might have uses. Primarily I'd need to know that it abides by the 7 laws of identity (http://technet.microsoft.com/en-us/magazine/2006.07.7laws.aspx http://technet.microsoft.com/en-us/magazine/2006.07.7laws.as...). A lot of this technology exists. CardSpace is one example of a client app (I wouldn't use a web app to manage my reputation, but would be ok to use a service to let others leave feedback about me). Attribute provisioning in identity federation is another, and could be used as a mechanism to check someone's reputation, or to give feedback.