1. Pushed salaries up across the board. Many people are not aware, but facebook was a major driver behind the 500k+ senior engineering pay.
2. Released major open source software: PyTorch, React, GraphQL, React Native. They basically invented modern web development.
Facebook is basically the only game in town when it comes to open source. Whatsmore, Mark Zuckerberg should be more widely applauded. I know his open source ai strategy has capitalist roots, but its still great for the world.