Which customer feedback innovation did major dictionary publishers like Oxford and Merriam-Webster implement in the 2010s that revolutionized how new words are added to dictionaries?

The evolution of language reference tools has been dramatically accelerated by digital technology. Modern dictionary products have undergone remarkable transformations in how they collect customer feedback, develop new features, and enhance user engagement. This trivia question explores a pivotal innovation in how dictionary companies revolutionized their product development and customer feedback processes in the digital age.

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Crowdsourced word submissions through specialized mobile apps and social media campaigns
Annual mail-in surveys sent to linguistics professors at major universities
Automated word frequency analysis from exclusively academic publications
Subscription-based voting system where paying customers determine new entries