[cj]

Related:

> Facebook was initially coded in pure, vanilla PHP, but over the years, [they] needed more capabilities [...] so, FB developed their own proprietary programming language based on PHP, which they dubbed Hack."

https://www.quora.com/Is-Facebook-still-coded-in-PHP

[steveklabnik]

Okay, so this is speculation, basically. I thought that may be what the parent was saying, but wasn't sure.