How can I have facebook Thumnail for pictures in forum

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I have a forum that made it by MYBB system and every photo in every post of my Forum just shown for Registered User, and when I share it in Facebook it doesn't show post photo in thumbnail!! I want to know how can I register Facebook Crawler for this kind of thumbnail ?? or is there any way to make it shown for Facebook??

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You need to

  1. Add the Open Graph meta tags to your pages (see https://developers.facebook.com/docs/opengraph/ )
  2. Ensure that the tags are available to Facebook's crawler (which won't be logged in to your site),
  3. Check what facebook is detecting on your page using the debug tool ( http://developers.facebook.com/tools/debug )