When you view the fight page, everyone on that page is sent a link in the background to be added to your mob. It doesn't count towards your '20 a day' limit and you do not need to add them as friends to your facebook.

When you first install and every few hours the script will go to the mob page to grab a new request ID, I am unsure why this ID changes but just to be safe, I have made it automatically change and grab a new one every few hours.

There isn't anything visual to see but if you go to your mob page and look at 'Sent invitations' that number should be going up slowly, by 16 every 'fresh' fight page.