Relative URI/Link paths - Facebook wall feed

Hi - I have added a feed from a Facebook groups wall, and the feed does not use an absolute URI for the ID, or an absolute URL for the link. eg:

<entry>
    <title> The New Zealand Herald is pleased to announce a media partnership with the 2010 National NZI Sustainable Business Network Awards.  They join NZI, as well as Corporate Express, EECA, Vodafone and the University of Waikato Management School. This year the awards recognise ‘Extraordinary Business’. Yippeee</title>
    <id>01be0d41241560d0d81a9c126fb12861</id>
    <link rel="alternate" type="text/html" href="/posted.php?id=101490454925&amp;share_id=124515744246596&amp;comments=1#s124515744246596" />
    <published>2010-06-03T05:40:12+01:00</published>
    <updated>2010-06-03T05:40:12+01:00</updated>
    <author>
      <name>Sustainable Business Network</name>
    </author>
    <content type="html">The New Zealand Herald is pleased to announce a media partnership with the 2010 National NZI Sustainable Business Network Awards.  They join NZI, as well as Corporate Express, EECA, Vodafone and the University of Waikato Management School. This year the awards recognise ‘Extraordinary Business’. </content>
  </entry>

The feed entries created have links are relative - eg

Is there a way to get the absolute url used in links? It looks to me - as far as I can understand the w3c specs - that the feed is not valid. It fails the w3c validator - but then a lot of things do :-|

http://validator.w3.org/feed/