Hi, we have been using the link image_src and meta title description tags on our site for facebook. We have been having problems when we share the URL of our site directly on facebook, the preview of the article does not show up. Is this issue is because we don't have the open graph tags? Do we have to implement them. Also this issue is not consistent, does not occur on all pages. Its very random.
Site in question is www.nasa.gov
Sample page: http://www.nasa.gov/multimedia/imagegallery/image_feature_2239.html
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