I'm not sure what you're saying.. do you mean that when you Like the article, the image isn't appearing in Facebook? If so, make sure the "Use first image in article for default" setting is enabled in the Social Configuration -> Open Graph section of JFBConnect. Then, you can use the Facebook Lint tool to see what Facebook 'sees' about your page:
developers.facebook.com/tools/lint
Hope that helps, but if you were looking for something else, let us know!
Joomla Question- Insert image
