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I have twitter and facebook apps connected, all permissions granted, toggle for permissions turned on in Social Settings, included my FB id as the panic id (not sure if this is correct) and when I expired a supported campaign I do not see a post in either twitter or facebook. I should mention that i am using current 2.6 that was just uploaded on WP 4.0.
I set a campaign logged out, supported the campaign with facebook and twitter user, then checked both and not post. You can login to my admin if you like to reset the campaign time the “support” with your FB if you like.
Attached is an image showing the FB permissions. I tested this with 3.9.2 WP and had the exact same result, no posts.