title: How to create invite a friend in ruby on rails?
body: <p>I want to create the ability for a User to go to a form and put a first name and email address and send an invitation via email.</p>
  
  <p>When the recipient clicks on the included link and registers, the Recipient and User are now "friends."</p>
  
  <p>Is there a good tutorial to get me started on this?</p>