> Today, we’re excited to open-source and share this library more broadly, so that others can work together to build more delightful products. Facebook's post

> Today, we’re excited to open-source and share this library more broadly, so that others can work together to build more delightful products. Facebook's post explicitly states they view this as an open source library. So, while I agree that we cannot assume Facebook is in the business of free software, their post says they are releasing an open source library under a license that does not appear to follow OSI definition of open source.