Which innovative marketing strategy did Oxford Dictionary use in 2019 that increased user engagement with their mobile app by over 70% and revolutionized how consumers interact with linguistic products?

In today's digital age, language learning and reference tools have undergone remarkable transformations. Dictionary applications have evolved from simple word-lookup tools to sophisticated platforms incorporating AI, personalized learning paths, and interactive features. This poll tests your knowledge about a groundbreaking marketing strategy that revolutionized how consumers engage with dictionary applications in the linguistics market.

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Contextual learning paths that adapted to users' reading materials by analyzing texts they uploaded
Voice-activated etymology challenges that rewarded users with premium content for correctly identifying word origins
Gamified translation competitions where users competed globally to translate obscure idioms across languages
Augmented reality feature that allowed users to point their camera at objects and see their names in multiple languages