MVC :: How To Implement Page Caching On A Social Networking Web App

i am in the process of developing a social networking web app using asp.net mvc 2 and asp.net 3.5 sp1.I have implemented user authentication and role management (like admins, etc...) and i was wondering how i could implement page caching in such a scenario based on the user currently logged in.

Note that the web app page urls may, or may not contain the name of the user authenticated and that there are also pages available to both authenticated and both authenticated users.

What i would like to avoid is to make a cache version of a page for an authenticated user, available to a non authenticated or to another authenticated user.