[Analogpoint]

Create a plugin on the member_customfields hook, and turn the urls into links. Where 6 is the profile field ID.

if ($profilefield['value'] != '' AND $profilefield[profilefieldid] == 6) 
{
        $links = explode ("\n", $profilefield['value']);
        $output = array();
        foreach ($links as $link)
        {
                  $link = trim($link);
                  if (!empty($link))
                  {
                            $output[] = '<a href="' . $link . '">' . $link . '</a>';
                  }
        }
        $profilefield['value'] = implode('<br />', $output);
}