Which innovative product development strategy did Merriam-Webster implement in 2009 that revolutionized dictionary marketing and significantly boosted their brand relevance among younger demographics?

In the world of language reference tools, brand positioning and product development strategies have evolved dramatically with technology. This trivia question explores a pivotal moment in dictionary brand history that revolutionized how language reference products were marketed and developed. Test your knowledge of how a major dictionary brand transformed its product strategy to meet changing consumer needs in the digital age.

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Launching a viral 'Word of the Day' social media campaign featuring celebrity endorsements
Creating a free mobile dictionary app with pronunciation audio features
Introducing a subscription-based linguistic analysis tool for academic institutions
Developing an AI-powered spell-check plugin for Microsoft Office products