That's a great question! You are correct, at this time Instagram is not an available option for Social Share. This is however a feature request our Product Team is still collecting feedback on. Do you want their entire email converted and shrunk into a single image? Do you want to choose an image from their email to share? We want to make sure the connection we offer for Instagram is the best version we can provide. So any additional information on what our customers would like to see through posting on Instagram would be really helpful.