Twitter Infra

https://blog.twitter.com/engineering/en_us/topics/infrastructure/2017/the-infrastructure-behind-twitter-scale.html

Periscope infra:

(from https://qr.ae/TWrUa5 ) and a video https://www.youtube.com/watch?v=xjC3ZKYG74g

1. Wowza Media Systems for streaming
2. PubNub for the chatroom
3. Circle CI and Travis CI
4. Fabric
5. Iron.io
6. Algoria for search and indexing
7. Slack