I added a Facebook Like Button with Open Graph to this website today.  When I tried out the button in with my own Facebook account I was getting the wrong picture and description sent to my profile page - it was taking the site main title, description and the first image it came to.  It appears this is due to Facebook caching and you can simply update what it has cached by running your page through the Facebook URL Linter and then it updates the information in the posts. 

Facebook URL Linter