> “If it was set in stone we use Perl, MongoDB, CGI... I'd probably ultimately be more productive than I've been lately despite the stack.” Facebook decided to

> “If it was set in stone we use Perl, MongoDB, CGI... I'd probably ultimately be more productive than I've been lately despite the stack.” Facebook decided to stick with PHP and MySQL from their early days rather than rewrite, and they’re still today on a stack derived from the original one. It was the right decision IMO. They prioritized product velocity and trusted that issues with the stack could be resolved with money when the time comes. And that’s what they’ve done by any metric. While nominally a PHP family language, Meta’s Hack and its associated homegrown ecosystem provides one of the best developer experiences on the planet, and has scaled up to three billion active users.