How to deny access to Facebook website?

I am using TP-Link Wireless ADSL modem router. How I deny user access to Facebook is based on my TP-Link router setting.

1. Type the router IP address on your browser.

2. Key-in the username and password.

3. Click on Access Management.

4. Click on Filter.

5. In the Filter Selection Type, select URL Filter.

6. On Active, select Yes radio button.

7. In URL index , select 1.

8. In URL, type www.facebook.com

9. Click on SAVE.

10. In URL index , select 2.

11. In URL, type facebook.com

12. Click on SAVE.

OK that is it. Happy trying. No more farmville !!