Which innovative marketing strategy was first used by Oxford University Press in 2003 that led to a 43% increase in dictionary sales and was subsequently adopted by competitors worldwide?

In linguistics and language product marketing, certain advertising techniques have proven remarkably effective at boosting sales of language learning tools and dictionaries. One particularly fascinating phenomenon occurred in the early 2000s that revolutionized how language products were advertised to the public. This campaign shifted the perception of dictionaries from reference tools to essential learning companions. Test your knowledge about this pivotal marketing strategy that changed the language product industry!

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The "Word of the Day" social media campaign that featured celebrities explaining their favorite obscure words
The "Language Journey" concept that positioned dictionaries as essential companions for lifelong learning rather than reference tools
The "Etymology Challenge" television ads showing the surprising origins of common words
The "Dictionary Deficit" campaign claiming research showed non-dictionary owners had measurably smaller vocabularies