Yo app

https://medium.com/@YoAppStatus/add-real-time-yo-notifications-with-these-4-easy-steps-screenshots-9704ed19b0a6

https://medium.com/@YoAppStatus/yo-developers-api-e7f2f0ec5c3c

https://medium.com/@YoAppStatus/yo-team-uses-slack-and-loves-it-b1e756555e30

http://mobile.nytimes.com/blogs/dealbook/2014/07/18/yo-one-word-messaging-app-is-valued-at-up-to-10-million/

http://blog.betaworks.com/post/92151557623/yo