Here’s a neat advanced trick you can use to customize the way your email shows up on Facebook. It’ll assign the image of your choosing as Facebook’s thumbnail whenever it’s shared. Once you’ve added images to your campaign as you normally would (through the WYSIWYG editor), double click on the image you’d like Facebook to show as your thumbnail. When the Image Properties dialog box appears, click on the Advanced tab and enter “campaign-icon” (without quotes) in the Id field:
