/ip firewall filter
add action=drop chain=forward dst-address-list=Facebook src-address=192.168.50.0/24 comment="Blocking Facebook on RouterOS using TLS Host"

/ip firewall mangle
add action=add-dst-to-address-list address-list=Facebook address-list-timeout=4w2d chain=prerouting dst-port=443 protocol=tcp tls-host=*.facebook.com comment="Detecting IP Addresses Facebook"


After putting the script on RouterOS. Please do this before using it.
1. Clear Traffic Connections on RouterOS.
   - IP -> Firewall -> Connections
   - Delete All Connections (Shortcut key: CTRL + A And Click remove button)
2. Clear Cache on your web browser.