I've just shared a topic on our site's facebook fan page, then I noticed that thread's meta description as the same domain meta tag.
The previous shared threads show the threads own meta tag before 3.5.2.
The issue is the same with vbseo, please check this thread meta tag on page source.
Something goes wrong ?Code:<meta property="fb:app_id" content="136202606395047" /> <meta property="og:site_name" content="vBulletin SEO Forums" /> <meta property="og:description" content="Discussion forum on vBulletin Search Engine Optimization (SEO) and vBSEO Plugin." />