title: In Facebook app, is there a way to link directly to "join a group"
body: <p>I'd like to have a link for a user to join a Facebook group from within my Facebook application.</p>
  
  <p>Here is the link on Facebook's "display a group" page (minus a longer referrer part), but the group id is encrypted:</p>
  
  <p><a href="http://www.new.facebook.com/group.php?sid=c431b3cfc02765def331081f8b71ffbd" rel="nofollow noreferrer">http://www.new.facebook.com/group.php?sid=c431b3cfc02765def331081f8b71ffbd</a></p>
  
  <p>Anyone know how to either encrypt a group id the Facebook way or otherwise build a link that adds a user to a group?</p>
  
  <p>Thanks!</p>