How Duolingo's new gamification mechanism convinced me to pay, by Shengyu Chen

I have been a Duolingo power user for 3 years now. My longest streak on Duolingo is 345 days (till this very day, I am still impressed by myself with that ;) ). I never paid a dime during that time…

Shengyu Chen – Medium

How Duolingo's new gamification mechanism convinced me to pay

Recommender Systems Intro Notes(Stanford Mining Massive Datasets

How Duolingo's new gamification mechanism convinced me to pay

How to have a go-to-market organization at Scale (From A16z's

Shengyu Chen – Medium

Shengyu Chen – Medium

Do things that don't scale. PG's original essay that was published

The 1st 20 hours — Josh Kaufman's theory (Thoughts on Learning

How to have a go-to-market organization at Scale (From A16z's Mark

How to have a go-to-market organization at Scale (From A16z's Mark