Hi Aboo,
This is possible by having a combination of Notify-Page option and Time Quota policy (and a bit of policy tweaking). The notify page can be set to be delivered to a user who is trying to access Facebook.com. Set the frequency of the Notify-page to reset at Midnight. Now we need to create a separate web access layer. This web access layer should be having a layer guards with domain "facebook.com" and next is "request.header.Cookie="notified-NotifyUser1=1"". Within this layer, now create a TimeQuota object to set "Daily 10Mins". Done.
The good thing about this policy that it will only start the Time Quota counter after the customer accepting the Notify Page. So he is not affected when not accepting the notice OR by some other website pulling objects from Facebook.com.