While viewing shared items, you can toggle between list view and expended view by clicking the corresponding tabs at the top right. You can mark all shared items as read. You can click the gray arrow button to open the full article in a new window. The toolbar at the bottom of each item is the same as for your other feeds, including buttons for: Add Star, Share, Share with Note, Email, Keep Unread, and Add Tags. While viewing people you're sharing with, you can hover over one name. If they're a Google contact, their Google profile information will come up.