How to Make Preview Thumbnails Show Up When Posting to Facebook
Facebook attempts to automatically display a thumbnail image when you post a website link on your Facebook wall. If you don't have an available thumbnail, no image is shown. You can specify a thumbnail image for Facebook to use by adding a meta property tag into your page code. The property links to a thumbnail image hosted on your website, which Facebook shows on your wall post.
Instructions
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Right-click your website's homepage file and click "Open With." Click the HTML editor you use to edit your website files.
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Add the meta property tag within your "<head>" and "</head>" tags. The following code shows you the syntax for the Facebook meta tag: <meta property=”og:image” content=”http://yoursite.com/image.jpg” />. Replace the "content" link with the location of the site thumbnail you want to use.
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Save the changes to the homepage and upload the new page to your domain host provider.
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Open a Web browser window and log in to your Facebook account. Type your website name in the status text box and click "Share." Notice Facebook automatically retrieves the linked thumbnail and shows it in your wall post.
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