By default, Facebook lets friends post articles on your Facebook wall, when they go directly to your Facebook wall or tag your Facebook account. This also somewhat affects the personal privacy of your Facebook account, by displaying posts that you do not want to have. To avoid inappropriate posts on your Facebook wall, you can block others from posting on your personal Facebook wall, according to the instructions below.
How to block posting to your Facebook wall on your phone
Step 1:
At the interface on the Facebook application, you Click on the avatar below. Then switch to the new interface, click cog icon.


Step 2:
Continue in the interface as shown, click Personal page and tagging section. In the settings for this Facebook profile you will see Who can post to your profile option. Here Facebook defaults to your friends. We click here to change the settings again.


Step 3:
To block others from posting on your Facebook wall, lock your Facebook Wall Tap Only me.
Step 4:
Next you can also Adjust who can see posts others post on your Facebook wallif we let others post on personal Facebook. You choose the mode for people who want to see posts on your Facebook profile page.


So your Facebook profile will be safer.
Video instructions to block others from posting on Facebook wall
How to block others from posting on your personal Facebook page on PC
Step 1:
First, click on your Facebook account avatar and then click Settings section. Next, switch to the new interface, click Privacy section to adjust.
Step 2:
Continue Click on Personal page and tag to readjust the interface of your Facebook personal page.
Now display your personal settings, click on it Who can post to your profile?then switch back Just me to perform.
Then you save the new settings for your Facebook personal page.