Facebook Opengraph expert needed

We have added a recommend button to a client site, but when clicked the information posted is not as expected. Instead of the image, title and description defined using Opengraph properties, we have ... * Title = Site name | Facebook * Image = Facebook logo * Description = "Facebook is a social utility that connects people with friends and others who work, study ...." ... and we want to know why! It will probably be obvious to a worker with lots of experience implementing social media gadgets.