Did you want to nobody can post on your facebook timeline?

First of all login your Facebook account. Then click the button near the home. Then click on Privacy setting which is on this picture also.

Now you will find there "Timeline and tagging". Now click on "edit settings". 

Now you will see a who can post on your timeline. Now you see "who can post on your timeline". You should click there on friends. Now you will see "No one option there. You should select "No one option". Then click on done. 
Now Nobody can post on your timeline.