I've just posted on my blog and am using Facebook plugin to publish to my fan page. The posting I made created a link on the page which lacks the thumbnail (featured image) and excerpt. Instead, it looks rather uninviting like this:
Graham Stoney: Internet Comedian shared a link via GrahamStoney.com. 26 minutes ago http://grahamstoney.com/drama/2013-oscars-stub-big-toe grahamstoney.com
Occasionally I see this when sharing links manually on Facebook too: sometimes the thumbnail appears, sometimes not. What is going on here?