7. Cristiano Ronaldo
Age: 26
2010-2011 Income: $38 Million

The Real Madrid star is using social media to expand his brand, which makes him more attractive to current sponsorship partners like Nike, Castrol, Clear Shampoo and Banco Espirito. Ronaldo has racked up 25 million Facebook fans, more than twice as many as any other athlete. He also has nearly 3 million Twitter followers.

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