How to block some friends from commenting on Facebook?

[Happy]

Part 1:
Login to facebook->Click the arrow down button beside the HOME->Click Privacy Settings->Click edit settings of PROFILE AND TAGGING-> Set "Review Posts friends tag you in before they appear on your profile" ON/Enable.
Also you should Enable this setting under PROFILE AND TAGGING "REVIEW TAGS Friends add to your own posts on facebook"

Part 2:
Under your privacy settings-> Click on Manage Blocking-> Click "EDIT LIST" of "Add friends to your Restricted list". Type your friends name. Please remember:

"When you add friends to your Restricted list they can only see the information and posts that you make public. Facebook does not notify your friends when you add them to your Restricted list"



Hope this will help.