You can post content to the entire organisation through the following method: –
Log in to the main organisation account and navigate to the admin panel (this is the top button int he left hand menu)
On the right hand side of the page, you will see the following: –
You can type a post, or, upload a photo or video. Once you have done this, click “Post” and your post will be in the newsfeed of all members of the organisation.