This plugin rocks! Seems to work just as I want, except for one thing. I get an error when clicking "invite friends":
Error while loading page from mypage
The URL http://my.url/wordpress/index.php?is_invite=true&fb_force_mode=fbml did not respond.
There are still a few kinks Facebook and the makers of mypage are trying to iron out. We appreciate your patience as we try to fix these issues. Your problem has been logged - if it persists, please come back in a few days. Thanks!
The weird thing is that if I go to the url in the message, I see this:
<fb:fbml>
<fb:title>Invite Friends</fb:title>
<fb:request-form action="http://apps.facebook.com/xxxxx"
method="post" type="x x x"
content="<fb:name uid="xxx" firstnameonly="true" shownetwork="false"/> has started using <a href="http://apps.facebook.com/xxx/">x x x</a> and thought you should try it out!
<fb:req-choice url="http://www.facebook.com/add.php?api_key=xxx" label="Add x x x to your profile"/>"
image="">
<fb:multi-friend-selector actiontext="Here are your friends who don't
have x x x yet. Invite all you want - it's free!"
exclude_ids="" bypass="cancel" />
</fb:request-form>
</fb:fbml>
So what's wrong here?