Which of these words was officially added to the Oxford English Dictionary first, marking a significant product launch in the evolution of modern English vocabulary?

The Oxford English Dictionary (OED) is considered the definitive record of the English language, documenting words and their evolution over time. Each year, language authorities evaluate new terms that have gained significant cultural relevance and decide which ones deserve official recognition. This process reflects how product development works in linguistics - with new 'language products' (words) being tested in the market before gaining official acceptance. Test your knowledge about this fascinating aspect of language evolution!

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Selfie (a photograph taken of oneself)
Podcast (digital audio file made available for downloading)
Emoji (small digital image used to express an idea or emotion)
Cryptocurrency (digital currency using encryption techniques)