The code for links posted within notes appear as so:
<a href="/note_redirect.php?note_id=396569262314&h=0b433086f1b39a09b03ca717f5517705&url=http%3A%2F%2Fwww.justiceclaus.com" target="_blank" title="http://www.justiceclaus.com">justiceclaus.com</a>
As where links everywhere else are explicitly no-follow like this:
<a href="http://www.facebook.com/l.php?u=http%3A%2F%2Fwww.justiceclause.com%2F&amp;h=f24fa" onmousedown="UntrustedLink.bootstrap($(this), "f24fa", event);" rel="nofollow" target="_blank">http://www.justiceclause.com/</a>