(story submitter here) This is true and should be acknowledged. To be honest, I submitted it because like many others I learned something from the author's blo

(story submitter here) This is true and should be acknowledged. To be honest, I submitted it because like many others I learned something from the author's blog, and followed it over the years I also submitted it under a title involving "probabilistic programming languages", thinking "it's cool that you can get paid to work on such a thing" Though it's also true that I don't use Facebook and would probably not want it to be optimized any more than it is :-/ I also worked in Big tech and there is a lot of genuinely useful knowledge and practice "locked up" there -- i.e. knowledge that is not in open source code. They have assembled a lot of expertise The P programming language (for concurrency / state machines) is another example of that -- it's used inside Microsoft Windows and AWS, and is beyond the state of the art elsewhere. I don't know what to do about that, but it should be acknowledged. We should also acknowledge that some big tech products are great and world changing in a largely positive way (even though in my personal opinion Facebook is the least of those, I can also see it argued the other way).