OF ALL TIME

1) Rihanna (47,571,000) 
2) Black Eyed Peas (42,405,000) 
3) Eminem (42,290,000) 
4) Lady GaGa (42,078,000) 
5) Taylor Swift (41,821,000) 
6) Katy Perry (37,620,00) 
7) Lil Wayne (36,788,000) 
8) Beyonce Knowles (30,439,000) 
9) Kanye West (30,242,000) 
10) Britney Spears (28,665,000)

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OF 2011 

1) Katy Perry (15,187,000) 
2) Adele (14,247,000) 
3) Rihanna (13,918,000) 
4) “Glee” cast (13,580,000) 
5) Lady GaGa (12,768,000) 
6) Lil Wayne (12,335,000) 
7) LMFAO (10,507,000) 
8) Bruno Mars (10,443,000) 
9) Eminem (9,264,000) 
10) Chris Brown (8,770,000)