To control what visitors can post on your Page:
Click Settings at the top of your Page.
From General, click Visitor Posts.
Select Allow visitors to the Page to publish posts or Disable posts by other people on the Page. If you allow visitors to publish posts, you can choose to:Allow photo and video posts
Review posts by other people before they're published to the Page
Click Save Changes.
If you choose to review posts, posts by others will be hidden from your Page by default. To approve a post, go to the Posts by Others section of your Page's activity log, click next to the post and select Allowed on Page.