So jetpack has the built in "Subscribe to" box which will ultimately send out updates to all who are registered and it stores the email addresses incase I want to do a non WordPress emailing. But I would really like to be able to place a subscribe to button/box on my Facebook page, twitter page and even my main webpage. Is there anyway to place a "subscribe to" box on any of the above mentioned pages that will place emails into the same database and still send emails with the updates? Any help is greatly appreciated. Thanks.