Preventing some users on my network access to facebook

RouterOS Beginner Basics
1

Hello
I have a mikrotik750gl router and i want to prevent access to some of my computers to facebook,but not all. Computers have static ip

Example: i have computers from 10.94.0.1 to 30
I want to block access to http://www.facebook.com and https://www.facebook.com for all except 10.94.0.8

2

Have you tried google or the wiki?

http://bit.ly/1IJvz4D

3

I tried it, it either blocks access to internet, or it prevents access to http://facebook.com but not https://www.facebook.com
Can you guide me how to do this in winbox step by step ? I appreciate your help