I have seen google and Facebook first hand. The practice is widespread, but the acceptance of "let's test it in prod" as a real stage in software development va

I have seen google and Facebook first hand. The practice is widespread, but the acceptance of "let's test it in prod" as a real stage in software development varies. Some people look at you like you are crazy person that should not be trusted, some people acknowledge and know it to be true. Feature testing is one thing, but you can go a/b testing a whole binary between new and old version to catch interesting bugs too.