/ip firewall layer7-protocol add comment="" name=facebook regexp="^.*(facebook).*\$"
/ip firewall layer7-protocol add comment="" name=youtube regexp="^.*(youtube).*\$"
/ip firewall filter add action=drop chain=forward comment="" disabled=no layer7-protocol=facebook src-address=10.26.13.218
/ip firewall filter add action=drop chain=forward comment="" disabled=no layer7-protocol=youtube src-address=10.26.13.218