See the following -

Facebook Introduces ‘Hack,’ The Programming Language Of The Future

Cade Metz | Wired Enterprise | March 20, 2014

Facebook engineers Bryan O’Sullivan, Julien Verlaguet, and Alok Menghrajani spent the last few years building a programming language unlike any other. Working alongside a handful of others inside the social networking giant, they fashioned a language that lets programmers build complex websites and other software at great speed while still ensuring that their software code is precisely organized and relatively free of flaws — a combination that few of today’s languages even approach.

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Facebook Rebooting Their Open Source Contributions

Jason Hibbets | OpenSource.com | April 7, 2014

Facebook is on a new open source journey. They're managing hundreds of active open source projects across the company and over the last nine months, have rebooted how they run those projects.

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