https deny( block ) how come ???

there is some sites have more than one ip like https://www.facebook.com how can i block this site by name not by ip ???

  1. option,
    /ip web-proxy access

2 option,
add IP addresses to address-list and use one firewall rule to drop the traffic.

i want it by name or protocol https://www.facebook.com coz this site has more than 1 ip address

This post might be helpful:
http://forum.mikrotik.com/t/i-want-to-block-the-facebook-in-my-internal-network/49776/1