Ben Kehoe, who works at iRobot, has written quite about using serverless in production. [1] So has Paul Johnston. [2]
I've been curious about serverless adoption too, and I've thought about doing more structured research and writing. So I'm curious to know what kind of content you're interested in.
My impression is that a lot of companies are using bits and pieces of serverless tech/architectures here and there around the edges - for some data processing pipeline, for an internal tool, for a few supporting services - but very few companies have a 100% serverless stack.
[1] https://medium.com/@ben11kehoe [2] https://medium.com/@PaulDJohnston