I apologize for the experience you're having with social share. If there is any button under the message you are seeing that says "Want to send it now" or "Click here to fix it," clicking on that link can help. Did clicking on this link help your email to be posted? Also, what is the exact error message you are seeing? Would you be able to get a screenshot of this? Having these details can help us to troubleshoot this further for you.
Feel free to respond to this post with your answers. If you wanted to continue this conversation privately you can also email us at social_support(at)constantcontact(dot)com with your username, the name of the campaign you are sharing, and a reference to this post.