How can i block website or ip from my mikrotik router?

How can i block website or ip from my mikrotik router?

I need to stop my staff from accessing Facebook and Twitter during working hours, how can i control it from my mikrotik router board 750?

Thank You

Have you searched the forum? It’s discussed so many times…

I tried this but its not working. Does it matter what position the firewall rule is? Right now its at the end.

Can anyone tell me why this isn’t working?

Move that rule to top and will start working!