I was excited to stumble across this question in a Google search, and hopeful it'd contain a solution. I was disappointed. In an ideal world, the Constant Contact "Email settings" screen would let us enter a link to our open graph image into a box, similar to the Subject, Preheader and From name boxes. Instead, it looks like CC isn't informed about how social media works and has no plans to change that, which is unfortunate.
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