Link Images: It's just another detail

Thought this was interesting. I was trying to message a friend on facebook with a link to my project. I thought it was strange when it grabbed a random image from my site to post with the link, title and description. I thought I would investigate it and found out what code to use so that you can control which image is displayed in this case and in others like it. Just a little detail.

This is a meta data tag and should go inbetween the <head> of your document.