I have had success in the past creating an App Definition for LinkedIn Messenger to allow access to LinkedIn while blocking the messenger functionality through Domain:www.linkedin.com and Path: /messaging/,/voyager/api/messaging/.
Has anyone had success replicating the same control to allow access to Facebook while blocking the messenger functionality?
I have also tried blocking the Post activity for the Facebook application but that only seems to work for posts on the Facebook wall and does not apply any control to Facebook Messenger.
@PaulJHerrmann you can add the following domains to a custom URL list, then a custom category. Finally, block the newly created category with a Realtime Protection policy and Facebook will operate just fine, while messenger won't: