[kh99]

You could show up to 6 random friends like this:

global $vbulletin;

$friends = $vbulletin->db->query_read_slave("SELECT 
				user.*, userlist.type, userlist.friend
			FROM " . TABLE_PREFIX . "userlist AS userlist
			INNER JOIN " . TABLE_PREFIX . "user AS user ON (user.userid = userlist.relationid)
			WHERE userlist.userid = " . $vbulletin->userinfo['userid'] . " AND userlist.type='buddy' AND userlist.friend='yes'
			ORDER BY RAND()
			LIMIT 6
		");

while ($friend = $vbulletin->db->fetch_array($friends))
{
    $output .= '<a href="member.php?u=' . $friend['userid'] . '">' . $friend['username'] . "</a><br />\r\n";
}