- MattVsJapan is a YouTube channel about learning Japanese.
- I believe that MattVsJapan's public learning played a significant role in popularizing the use of spaced repetition systems for language learning.
- Today, the use of spaced repetition for language learning is considered one of the common sense principles for learning a language (at least amongst savvy internet users).
- MattVsJapan can be seen as an example of the power of social proof in popularizing the use of spaced repetition.