How do I block someone on facebook?

To block someone:

1.     Click the account menu  at the top right of any Facebook page and choose Privacy Settings.

2.     Scroll to the Blocked People and Apps section and click Manage Blocking.

3.     Enter the name or email address of the person you want to block and click Block. People will not be notified when you block them.

If you can’t find someone using this method, try going to the person’s timeline and selecting Report/Block This Person from the  dropdown. 

If you can’t find the person you are trying to block, learn more. 

If you still can’t block someone using the methods described above, it’s possible that this person left Facebook or restricted their privacy settings. Besides blocking, there are other ways to control who can see the things you post on your timeline. Learn more about your Privacy Settings.