I implemented the subscribe script at: http://www.jwsuretybonds.com/surety-bonds/commercial-bonds/auto_dealer_bond.htm
Unfortunately, the FB php script displays the text and I am not sure the white hat way to hide it from the browsers since they already see the commments in the iframe.
I also found that FB has a variable for 'send_notification_uid', which you can loust your user id to be notified. I implemented both for now and will see which is better.