The Insider.com

Based on Apple iTunes sales, Adele is the number one artist of 2011.

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Topping the album charts was her Grammy-nominated 21 while Mumford & Sons' Sigh No More, Lil Wayne's Tha Carter IV, Jay-Z and Kanye West's Watch the Throne and Coldplay's Mylo Xyloto followed. As far as singles go, Rolling in the Deep led LMFAO's Party Rock Anthem, Katy Perry's Firework, Bruno Mars' Grenade and Cee-Lo Green's Forget You.

The Social Network was the most-downloaded movie while an episode of The Walking Dead episode was TV's most downloaded.

Walter Isaacson's Steve Jobs biography was the most bought book on iTunes -- which is a fitting tribute to the late Apple co-founder.