Hi, your plugin makes alot of sense and is exactly what I was looking for!
Installed it on one site - works beautifully
Installed on 2nd site (on exact same server) - get this error: Your website needs to be publicly accessible to use Jetpack: site_inaccessible
Error Details: The Jetpack server was unable to communicate with your site [HTTP 503]. Ask your web host if they allow connections from WordPress.com. If you need further assistance, contact Jetpack Support: http://jetpack.me/support/