The Pin post feature.
Owners and moderators of Google+ Communities can ‘pin’ any post to the top of the community. This ensures the post stays highly visible and does not get lost amongst all the other content. It’s great for posts that include information on assessment, how to use the community, weekly topics and readings, upcoming excursions and events or anything that you want to make sure your students actually see!
Pinning a post is quick and easy:
1. Create and share the post.
2. Once shared, click the small grey arrow in the top right corner of the post.
3. Select Pin post from the menu.
4. The post will now display a pin icon in the top right corner. It will stay at the top of the stream until it is unpinned.
Tip: To unpin a post, click the small grey arrow in the top right corner of the post and select Unpin post.