Forbes' "Most Powerful Female Celebrity" in 2011, Lady Gaga, has also become the most powerful person on Twitter, accomplishing the feat of becoming the first person to have over 20 million followers on the social networking service. She was also the first to reach 10 million last May. Coming in at a close second place is Justin Bieber, who currently has about 18.1 million followers.
[via NME]
