Check this link to Qbik's knowledgbase:
http://support.qbik.com/index.php?_a=kn ... %3C%2Fa%3E
This article talks about banning particular sites, but it equally applies to allowing sites as well
IF instead of using
This criterion is NOT met if .... use
This criterion is met if... and enter the HTTP URL you wish to allow. You can repeat this for more than one site if you wish. So only sites that meet the criterion you select will be allowed.
Hope this helps.