How Much Is a Celebrity Endorsement Really Worth?

Following the news that actress Cameron Diaz is releasing a fitness book Bloomberg examines how much a celebrity endorsement is worth.

Twitter Earnings Disappointment: What Went Wrong?
59:00 - Rina Hiranand, strategy director at Social@Ogilvy, discusses Twitter's earnings and what could help turn the company around. She speaks to Bloomberg's Angie Lau on "First Up." (Source: Bloomberg)
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