Facebook has an entirely different usage model. People have "profiles" and when you connect to someone's "profile", you see all their photos. Google Photos does

Facebook has an entirely different usage model. People have "profiles" and when you connect to someone's "profile", you see all their photos. Google Photos doesn't have an equivalent. Photos are in your account, and whenever you want, you share single ones, or group of them in an album, with friends. There's no concept of "friends" on Photos.