Lady Gaga dominates Twitter US singer Lady Gaga, pictured here in 2011, told Harvard students that "a culture of love" is needed...

Lady Gaga dominates Twitter

US singer Lady Gaga, pictured here in 2011, told Harvard students that "a culture of love" is needed to combat school bullying and low self-esteem among teens. (AFP Photo/Daniel Roland)

American pop star Lady Gaga

International pop diva Lady Gaga attends a welcoming ceremony during a "Lady Gaga Day" in Taichung, Taiwan, Sunday, July 3, 2011. Lady Gaga is visiting Taiwan for five days promoting her new album "Born This Way". (AP Photo/Wally Santana)

Lady Gaga poses in the press room at the 2010 MTV Video Music Awards at Nokia Theatre L.A. Live on September 12, 2010 in Los Angeles, California. (FilmMagic/Jon Kopaloff)

U.S. singer Lady Gaga gives a press conference ahead of her showcase concert at the Marina Bay Sands on Thursday July 7, 2011 in Singapore.(AP Photo/Wong Maye-E)

Lady Gaga performs "Paparazzi" at the 2009 MTV Video Music Awards in New York, September 13, 2009. (REUTERS/Gary Hershorn)

Singer Lady Gaga performs onstage at the iHeartRadio Music Festival held at the MGM Grand Garden Arena on September 24, 2011 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for Clear Channel)

Pop star Gaga busted through 20 million followers on social network Twitter this past weekend -- becoming the first celebrity to do so (even managing to beat out Ashton Kutcher!).