If you have Facebook options enabled in PBU/PPU, but nothing is being posted, it's likely due to one of 2 reasons: 1) Your Windows Firewall is enabled, or  2) You need to enable the individual Facebook accounts to allow for it

1) How to Disable Windows Firewall

2) Use steps below to disable Notifications that prevent posting to facebook 

1) Go into the Facebook Settings

2) Click on 'Security and Login' (as shown above)

3) Under 'Setting Up Extra Security' disable both notifications and email

4) Save changes and see if photos post successfully

NOTE: GIF's must be under 8mb in size to post to Facebook