Which linguistic advertising technique did Duolingo use in its 2021 "Push Notifications" campaign that led to a 40% increase in brand loyalty among 18-25 year olds?

In the competitive world of language learning products, branding and advertising strategies play a crucial role in market success. Companies invest heavily in distinctive marketing approaches to capture their target audience's attention and build brand loyalty. This trivia tests your knowledge of a revolutionary advertising campaign that transformed a language learning product's market position through innovative linguistic techniques.

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Anthropomorphizing their owl mascot with colloquial, guilt-inducing phrases ("I miss you!", "5 minutes is all I ask")
Implementing region-specific dialect targeting that adapted content based on users' local speech patterns
Using Contrastive Language Analysis that highlighted grammatical differences between languages to show learning progress
Developing Phonemic Engagement Metrics that rewarded users for mastering difficult pronunciation patterns