To begin with, celebs that go by just one name are always cool: Prince. Sting. Bono. But the coolest and most famous of them all is Oprah. Everyone is on a first name basis with Oprah because she’s been in our living rooms for over 20 years. Her influence knows no end. Everything is Oprah – Oprah’s Book Club, O Magazine, The Oprah Winfrey Show, Oprah’s Favourite Things, The Oprah Winfrey Leadership Academy for Girls. Some say she is the most influential person in the world.