"Open Neural Network Exchange (ONNX) format ... provides a shared model representation for interoperability and innovation in the AI framework ecosystem. Cognitive Toolkit, Caffe2, and PyTorch will all be supporting ONNX. Microsoft and Facebook co-developed ONNX as an open source project"
One more thing Microsoft & Facebook did together: an huge-capacity across-ocean optical cable:
Microsoft and Facebook just laid a 160-terabits-per-second cable 4,100 miles across the Atlantic - The Verge