Which AI translation breakthrough led to a massive shift in language product marketing on social media between 2016-2017?

The language technology industry has witnessed tremendous evolution in how brands market their translation and language learning products. One particular breakthrough in neural machine translation fundamentally changed how these products are advertised on social media and beyond, creating a watershed moment that divided the industry into 'before' and 'after' periods. Test your knowledge about this pivotal development in language technology marketing!

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Google's implementation of Neural Machine Translation (NMT)
Microsoft's acquisition of Duolingo's translation technology
Facebook's launch of Universal Language Translator
Amazon's introduction of Real-Time Translation Services