What language is Meta?

Meta (formerly Facebook) uses a variety of programming languages across its platforms, products, and services. The company has a diverse tech stack tailored to its massive scale and the specific needs of each service. Here are the main programming languages used at Meta:

1. Hack (PHP Dialect)

• Core Language: Meta originally started with PHP but developed Hack, a dialect of PHP, to address performance and scalability needs. Hack adds static typing and other features to improve code safety and performance.
• Use: Hack is used for much of Meta’s backend services, including the core Facebook application.
• Source: Hack: Programming Language

2. C++

• High-Performance Applications: C++ is used extensively at Meta for performance-critical backend services. It powers key systems such as the news feed, messaging, and real-time data processing.
• Source: Meta Engineering

3. Python

• Data Science and AI: Python is widely used for data analysis, machine learning, and automation. Meta developed PyTorch, a popular open-source machine learning framework in Python, which is extensively used both internally and in the AI research community.
• Source: PyTorch by Meta