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After looking on the Facebook developers page I saw that you need to add a meta tag to the root of your web page.
Unfortunately you cannot add to the root of your site on Yola.
You could try adding it to an HTML widget on your home page and see if this helps. Alternatively you could try adding it where you Google Webmaster code would go in your properties sidebar but this would stop your webmaster from working.
Do you know if there is another option to verify your site?