The News Feed page is most often used for the app admin(s) to send out notifications about the event to their audience. This is great for things like "buses are leaving" or "see the updated Documents page for the Keynote deck." This page type supports both text and photos posts.
Posts are added from your mobile device. You cannot currently add items to the News Feed from the online editor. To post from your phone or tablet, tap the pencil icon in the upper-right corner of the screen, then enter your message or photo.
Any time a user posts to the News Feed, those who have downloaded the app will receive a notification. If you want to change your notification settings, follow these steps.
In the Editor, you can restrict posting access on your Yapp to only the administrator.