# Massive-scale online collaboration

- Institution: TED
- Department: TEDxCMU
- Speaker: Luis von Ahn
- Year: 2011
- Level: For everyone
- Language: English
- Subjects: Computer science, Languages and linguistics
- Source: [TED](https://www.ted.com/talks/luis_von_ahn_massive_scale_online_collaboration)
- Licence: [CC BY-NC-ND 4.0](https://creativecommons.org/licenses/by-nc-nd/4.0/) (Non-commercial use only, and no changed versions.)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

After re-purposing CAPTCHA so each human-typed response helps digitize books, Luis von Ahn wondered how else to use small contributions by many on the Internet for greater good. In this talk, he shares how his ambitious new project, Duolingo, will help millions learn a new language while translating the web quickly and accurately -- all for free.

## Lectures

1. [Massive-scale online collaboration](https://invisiblenetwork.ai/learn/ted/luis_von_ahn_massive_scale_online_collaboration/0f191ed03eda), 17 min (TED's player)