What matters is a filtered view of what is happening in the community based on what matters most to you (who/what you follow, participate in, and comment on). It consists of three main streams: activity, communications, and actions.
The Activity stream of What Matters is where you can stay informed and engaged in activity happening in our community. This includes content, people and places you are following, as well as a way to see what matters most.
Communications allows you to jump straight to where you communicate with others and manage incoming communications, including @mentions, shares, and direct messages. The Communications area is your "social inbox" to the community.
Actions are available right from the homepage where you can manage all your awaiting workflow actions, including document and friending approval notifications.