What to do if you are receiving the following error when trying to post a banner on Facebook:

"User opted out of platform: The action attempted is disallowed, because the user has opted out of Facebook platform."

Open your Facebook settings or simply use this link:
​https://www.facebook.com/settings?tab=applications&ref=settings

Make sure the "Apps, Websites and Games" box under the "Preferences" section is turned on. If it's already turned on, simply turn it off and then back on.
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That's it, you should be able to share the banners now!