When you’re viewing or working on something in Google Drive and somebody else opens the same file, you’ll see his or her Google+ profile picture appear in the top-right corner of your browser window. (If the person doesn't have a Google+ profile picture, you'll see their first initial. If the person's viewing the item anonymously, they'll be assigned an animal name and image.) As more people open the document, more profile images appear. If you hover over a profile image, you’ll see information about the viewer pulled from his or her Google+ profile, and you can add the person to one of your Google+ circles with a click.