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The example given on the Facebook developer documentation page ( http://developers.facebook.com/docs/reference/fbml/serverFbml/ ) doesn’t work. This one does.
Note how some html is escaped and the multi-friend-selector is inside the form.
The code below allows you to add the large version of a friend select in the form of an invite tool to your iframe facebook applications:
<fb:serverFbml style="width: 755px;">
<script type="text/fbml">
<fb:fbml>
<fb:request-form
action=""
method="post"
invite="true"
type="XFBML"
content="This is a test invitation from XFBML test app
<fb:req-choice url="see fb:req-choice docs for details."
label="Ignore the Facebook test app!" />
">
<fb:multi-friend-selector
showborder="false"
actiontext="Invite your friends to use Socially." />
</fb:request-form>
</fb:fbml>
</script>
</fb:serverFbml>