I think /etc/hosts.deny and /etc/hosts.allow are files you have to edit and you would have to add somthing like
.facebook.com to block all the subdomains You could read the man page of hosts.deny using man hosts.deny
I think /etc/hosts.deny and /etc/hosts.allow are files you have to edit and you would have to add somthing like
.facebook.com to block all the subdomains You could read the man page of hosts.deny using man hosts.deny