Duolingo: Using the Wisdom of Crowds to Translate Language
Duolingo operates in a smart 鈥渢wofer鈥� model 鈥� offering free language courseware while monetizing the crowd-sourced content translated by its users.
duolingo
Lessons from Duolingo鈥檚 Effort to Support Free Language Learning from Crowdsourcing
@duolingo crowdsourced text translation platform allows users to learn a new languages online for free