Example addthis on our website:
When I press the facebook like button, it appears as a small line in my facebook wall. See screen shot: http://screencast.com/t/ApAi2BLJjJRX
Not only is it missing the Image, Title, and Description - it is also pushed well below other status updates that were made days before.
Why does it do this?
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/
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