Chatter: Company Highlights Feed, Create Custom Feeds, Customize Groups

We redesigned the Chatter home page in Lightning Experience to give you more of what you want—customization. We introduced the Company Highlights feed, the ability to create your own feeds with streams, a list of your recently updated groups, and a way to share posts. You can also create custom groups for any use case and filter questions in group feeds in communities and Lightning Experience.
Available in: Group, Professional, Enterprise, Performance, Unlimited, Contact Manager, and Developer Editions