Lady Gaga is Now Celebrity 100 List

These days that means mastering social media. Lady Gaga topples Oprah Winfrey from her No.1 spot on our list, which she's given up for only the third time in seven years.Gaga is there not just because of the $90 million she earned with a monster tour, but also because of her 32 million Facebook fans and 9.5 million Twitter followers -- aka Little Monsters -- who helped move 1 million digital