FB Live works really well but the playback for regular videos often gets stuck on the FB mobile. Not seeing the same problem on youtube or the mobile web version of FB.
I think the most interesting part to me is that the infrastructure is written in C++. With over a billion active users, this is likely a huge cost savings for them.
in what way ?
How does "infrastructure in C++" translate to huge cost savings?
C++ is faster and takes less memory than any interpreted language and most compiled languages. C++ will also simplify to C in most optimizations, which can strip away C++ cruft without removing type safety of c++.