Newsfeed. "NEWS" item in the main menu opens a new feed that collects posts from all feeds your node is subscribed to. To subscribe, click "Subscribe" button at the top of somebody's Timeline. At that moment, the latest 20 posts from this Timeline are automatically added to your Newsfeed. After that, all new posts published there are downloaded by your node and displayed in your Newsfeed. If the author updates a post, the changes will appear in the Newsfeed as well. Reactions you make to the post at the Newsfeed are sent to the original post, and all reactions made by others are visible in your Newsfeed.
For now, all newsfeeds are public, so you can read anybody's newsfeed. But this will be made optional in the future.