Kenneth,
That post happens when you first register on SourceCoast.com, and has nothing to do with your website or your use of JFBConnect. The post-to-wall feature is a part of JFBConnect that can be done when users register or login to your site. However, when you use it for your site, it can be configured to use your URL, image, and other information. We do not default it to SourceCoast.com for users, and in no way use our users to promote our extension for us.
Hope that makes sense, but if you have other questions or issues, just let us know.
Thanks,
Alex