Which product marketing campaign holds the Guinness World Record for 'Most participants in an online commercial'?

The world of retail is full of impressive marketing campaigns that have broken records and reshaped consumer behavior. This trivia challenges you to identify which product marketing strategy officially holds a Guinness World Record for its unprecedented success. Test your knowledge of remarkable retail achievements that pushed the boundaries of conventional marketing approaches and earned their place in the record books.

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Coca-Cola's 'Share a Coke' campaign where over 650,000 people submitted personalized virtual bottles online
Old Spice's 'Responses' campaign where Isaiah Mustafa created 186 personalized video responses to fans in real time
Blendtec's 'Will It Blend?' campaign featuring over 400 different household items being blended on YouTube
Dove's 'Real Beauty Sketches' campaign with 7.4 million participants contributing their self-descriptions online