[kh99]

Here's one way you might be able to do it: You would need to turn on "Show Users Browsing Thread" in the adminCP options, then create a plugin using hook showthread_loggedinuser and code like this:

$viewing_users[] = $loggedin['userid'];

Then you need to do a query, in another plugin using hook showthread_complete:

$viewing_users[] = $vbulletin->userinfo['userid'];
$field = 'fieldX'; // change X to your actual field #
$results = $vbulletin->db->query_read_slave("SELECT $field, count(*) AS num FROM " .   TABLE_PREFIX . "userfield WHERE userid IN (" . implode(',', $viewing_users) . ") GROUP BY $field");
while ($row = $vbulletin->db->fetch_array($results))
{
    $fruit_viewing[$row[$field]] = $row['num'];
}

// If you don't want to actually display the "users browsing", you could uncomment this:
// $show['activeusers'] = false;

vB_Template::preRegister('SHOWTHREAD', array('fruit_viewing' => $fruit_viewing));

Then in showthread where you want it to appear, something like:

<vb:each from="fruit_viewing" key="fruit" value="num">
    {vb:raw fruit}: {vb:raw num} 
</vb:each>

BTW, I haven't actually tried this.