Hi Michael,
I agree, it would be wonderful if we could bring Facebook and Google+ integration back to these apps, but as Aziza stated above, we were forced to remove support when Google and Facebook remove the capabilities from their APIs in response to demands for greater user privacy following the Cambridge Analytical scandal. For this reason, it is extremely unlikely that we will be able to bring this capability back to these apps.
You will continue to see configuration parameters for social logins in the apps at older versions of Portal, but the user information will not be stored as those components of the Google and Facebook APIs no longer work.
Social logins can be enabled and used through the organization as this capability was unaffected by the API changes. Unfortunately, the mechanism that we are using at the organization level is not available for us to include at the app level.
-Allison