Bloquear facebook https usando ipcop

add file /etc/rc.d/rc.firewall.local

#!/bin/sh
# Used for private firewall rules

# See how we were called.
case "$1" in
  start)
        ## add your 'start' rules here
        iptables -t nat -I PREROUTING -m tcp -p tcp -d www.facebook.com --dport 443 -j DROP
        iptables -t nat -I PREROUTING -m tcp -p tcp -d www.twitter.com --dport 443 -j DROP
        iptables -t nat -I PREROUTING -m tcp -p tcp -d www.youtube.com --dport 443 -j DROP
        ;;
  stop)
        ## add your 'stop' rules here
        ;;
  reload)
        $0 stop
        $0 start
        ## add your 'reload' rules here
        iptables -t nat -I PREROUTING -m tcp -p tcp -d www.facebook.com --dport 443 -j DROP
        iptables -t nat -I PREROUTING -m tcp -p tcp -d www.twitter.com --dport 443 -j DROP
        iptables -t nat -I PREROUTING -m tcp -p tcp -d www.youtube.com --dport 443 -j DROP
        ;;
  *)
        echo "Usage: $0 {start|stop|reload}"
        ;;
esac

Fuente: http://adabi.kelatekito.my/block-faceboo-https-port-using-ipcop/