Keith Adams explains how/where/why Facebook uses PHP, PHP's benefits (lack of state/programmer workflow/concurrency), efficient PHP with HHVM, the Hack project for optional typing PHP and much more.
Brian LeRoux talks about the PhoneGap Build service, mobile web apps vs native, Facebook's switch to a native iOS app, PhoneGap adoption in emerging markets, Firefox OS, Adobe's web tools and more.
Serkan Piantino explains how Facebook has managed to scale up, what types of errors occur in an architecture that size and how to handle them, RAM vs disk, and much more.
In this interview Jez Humble discusses the concept of continuous delivery, which implies that software should always be production ready throughout its lifecycle. That means that every build could be released into production and run effectively. Continuous delivery involves build and deployment automation, continuous integration, test automation, managing infrastructure and environments and more.