Facebook Like button does not work on site but FB URL Linter not reporting errors

Question

No idea why Facebook like button isn't working on this site: http://allisonchow.com

Clicking on the error link in error (shown in above screenshot) I get this error:

I've triple checked it through Facebook URL Linter ( https://developers.facebook.com/tools/debug/og/object?q=http%3A%2F%2Fallisonchow.com ) and it reports that there are no errors. I've tried the HTML5, XFBML as well as IFRAME versions of the button with no luck.

Other details:

FB URL linter sometimes reports warnings that og:url and og:title are not "explicitly provided":

The og:url property should be explicitly provided, even if a value can 
be inferred from other tags.

The og:title property should be explicitly provided, even if a value can 
be inferred from other tags.

However, the weird thing is that both these OpenGraph tags are specified in my code. FB Linter even confirms it by showing further down the same page:

Additionally, the linter will occassionally give this warning as well:

The og:locale property should be explicitly provided, even if a 
value can be inferred from other tags.

But again, if I reload the linter and run the URL through it again, the warnings will periodically appear and disappear. Ugh.

Unfortunately when a Like button doesn't work, if the Linter doesn't report errors I find it extremely hard to debug!

I must be missing something obvious so would love some help!

Answer 1

It is a facebook bug. http://developers.facebook.com/bugs/270137973042283