Tumblr and Twitter use Scala to solve their nice-to-have scalability problems using a services-based architecture. This is "core functionality must protected a

Tumblr and Twitter use Scala to solve their nice-to-have scalability problems using a services-based architecture. This is "core functionality must protected at all costs" conservatism. They still have PHP and Rails (respectively) up front. This is "we like to roll out new user-facing features regularly" liberalism.