facebook like button issues


I have been working onsetting up social addons - I can get most to work fine and i quite like the “add this” suite of buttons.

However whichever way I implement the facebook like button either through blocks or a new template though the recommended my changes, hooks etc the resulting product image transfered to facebook is of terrible quality or even the wrong image for example one of the accepted payment images in the footer, the facebook share button works well

has anyone else had this issue with either very poor or incorrect images?