Yes, this is possible with WebTitan. You can block certain elements of a website while allowing the site to be accessed. This is common with Facebook, as many businesses view Facebook Messenger as a security risk, but do not want to block access to the Facebook website. You can do this for Facebook Messenger (and other online chat programs) by blacklisting certain keywords to block the chat function in the ‘filtering URL keywords’ section. For Facebook, you block the keywords “ajax/mercury/send_messages.php” and “ajax/updatestatus.php”