I just added google +1 to my site and I have been trying to figure out how to set the default image for the post so when someone +1's an article or video on my site the image I set shows up in their stream. Currently it autoselects any pic on the page but 9 times out of 10 not the correct one I want. I know with Facebook "like" button you use a special meta tag but how do you do this for google +1? Any help would be greatly appreciated.