I have been thinking about cookie sandboxing for a while: The idea is to have a separate cookie store for each 2nd level domain I am visiting. So the Facebook

I have been thinking about cookie sandboxing for a while: The idea is to have a separate cookie store for each 2nd level domain I am visiting. So the Facebook cookie on some site I am visiting that has a Facebook "Like" button on it is different from the actual Facebook cookie I would get from visiting Facebook. This would make cookie tracking across sites unusable, since each site would have it's own version of a cookie.