Hey guys, there's a bug report for this here:
http://tracker.vbulletin.com/browse/VBIV-10916
I shared my workaround there, although it's a pain. Still, it's better than having no graphics (or repeated graphics) when sharing on FB for marketing purposes:
Quote:
As a workaround, enable HTML in ACP -> vBulletin CMS -> Permissions (HTML for Admin only).
Edit the article, paste this HTML code at the very bottom:
<head><link rel="image_src" href="http://yoursite.com/yourarticle/yourimage.png" /></head>
This will force FB to choose your specific article image as the thumbnail.
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