Which retail brand holds the Guinness World Record for the 'Largest Online Marketing Campaign' as measured by unique participants?

World records aren't just about human feats - they exist in the retail world too! The most successful marketing campaigns have broken records for customer engagement, sales growth, and brand recognition. Test your knowledge about a historic marketing campaign that earned its place in the record books. Do you know which brand's strategy created unprecedented customer response and set a new standard for the industry?

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Alibaba's Singles' Day campaign (2019)
Amazon's Prime Day campaign (2020)
Nike's 'Just Do It' 30th anniversary campaign (2018)
Coca-Cola's 'Share a Coke' personalized bottle campaign (2014)