Lady Gaga catapults onto the world’s most powerful celebs list (No.4), ranking ahead of much more established pop stars like Madonna (No. 10) and U2 (No. 7). She has a 106-date world tour and her willingness to partner with corporations like Virgin Mobile and Polaroid to thank for an estimated $62 million in earnings. What’s more, her fame and theatricality have brought her gobs of press coverage, while her music videos have made her something of an Internet sensation. Proof: The fashion-forward rocker ranks first for social media and Web presence among the Forbes Celebrity 100.