The reason I got this problem had to do with my MU domain mapping.
If my site’s URL is http://www.example.com, the ‘real’ site is on example.wordpress.myactualdomain.com. The real site name is what facebook sees and needs to be listed in the site URL’s. It’s at least necessary, not sure if it’s sufficient. I have both the real wordpress DNS name and the public DNS name listed now, and it’s working.
I have no idea except that I am using WordPress 3.4
My website is hosted by Just Host. Thats about all I know.
My wordpress and site address are both the same in the settings. Thats about all I can find out.
Note that my site is not “OttoPress.com”, nor is it “http://www.ottopress.com”. You have one URL, and you can’t guess at it, or make it up. It’s in the URL bar of your browser. It’s the only *real* URL of your site. Use it properly, don’t change the caps, don’t add non-existent www’s to it.
Note: If the back-end of your site has a totally different domain than the front end of your site, then you must give the Facebook Application BOTH domain names in “App Domains”, but only the main site URL in the “Site URL” field.
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