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i used this meta for my website
<meta property="og:image" content="http://tongkienphi.com/public/uploads/2013/3/702594ed31541de6fc7ab4ba488bc14f_thumb.jpg"/>
But, when i post one link to facebook, it's not detect that image, it's always detect banner image :(
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You might not be seeing the Facebook link preview you want because the info has been cached by Facebook. (Facebook saves the info from URLs and pages that have already been shared, for better performance.) So you just may need to force Facebook to clear the cache.
Inferred Property The 'og:image' property should be explicitly provided, even if a value can be inferred from other tags. If you do not have the Open Graph tags specified, then Facebook will only fill in the gaps for the image, title, and description.
The suggested size for a Facebook Open Graph image is about 1200 pixels by 630 pixels and should not be more than 8 MB, so remember to optimise the image. The recommended size is on the Facebook Developers page – Images in Link Shares. The minimum requirement is 200 by 200 pixels.
You can set a custom og:image on a page by page basis. Just go to Page Settings > Social Image > Upload. If you need to add other OG tags and customize the default settings, go to Page Settings > Advanced > Page Header Code Injection. Read the following section on adding the tags manually and copy-paste the code there.
Check that facebook has not already cached the header image before you added meta data.
Put your URL into this site and facebook will help you out:
http://developers.facebook.com/tools/debug
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