Like that idea. One should be able to create some "rules" for a browser, e.g. that any Facebook related url is going to be opened in a "clean" browser space. Ideally where one can attribute certain basics, such as proxies beforehand.
I seem to recall that part of Mozilla's work on bringing identity management into the browser was the idea that you could have different tabs with different sets of cookies associated with them.
In my case I have these blocked out with NoScript. But if you click on these and are not logged in you are most likely redirected to Facebook, right? So it would just open these in the separate FB environment (i.e. proxy&clean browser).
Luckily we live in a world where Flash is no longer a real requirement for most websites, and browsing with it completely disabled, or even uninstalled is not an issue.
afaik, facebook does not use flash cookies. In the initial blog post that caused the cookie uproar, I thought he mentioned that? Otherwise maybe it was somewhere else I read it.