Facebook is a complex web application developed using a variety of programming languages and technologies.
The core backend of Facebook is primarily built using PHP, a server-side scripting language that is optimized for web development. The Facebook website also uses several other backend technologies, including MySQL, Memcached, and Hadoop, among others.
The frontend of Facebook is built using a combination of HTML, CSS, and JavaScript, with the React JavaScript library serving as a primary component for building user interfaces.
Additionally, Facebook has developed several native mobile applications for iOS and Android devices, which are built using languages specific to those platforms, such as Swift and Objective-C for iOS and Java and Kotlin for Android.
Facebook also uses a range of other programming languages and technologies for various aspects of its platform, including Python, C++, and Hack.
Overall, the development of Facebook involves a complex set of technologies and languages, with PHP, JavaScript, and React serving as some of the primary building blocks for the platform.
