When I generate a feed post using the FB.ui function I find that frequently the image I attach to the post displays as a vertical gray bar. On the other hand, if I generate my feed posts using the direct https://www.facebook.com/dialog/feed url the image works 100% of the time. If I provide the Facebook Debugger it detects it as a Photo and displays the image at the bottom. When I click the ‘See exactly what our scraper sees for your URL’ it says that the ‘Document returned no data’. I assume this is because my image is not an open graph object? I’m very much at a loss here.
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The issue was our server, it was becoming inaccessible from the outside intermittently. This was causing Facebook to cache the broken links.