Please help ... how can I control what thumbnail is displayed when someone clicks to share on facebook?? Thanks soooo much for you help!
Facebook doesn't work like the other AddThis buttons. Instead of accepting parameters that we pass it, Facebook requests the URL you're sharing and gets the data it displays from the meta and link tags in the header. To control how your page is shared on Facebook you should use OpenGraph tags which are described in Facebook's documentation here: http://developers.facebook.com/docs/opengraph/
This question is closed to new answers.