90% sure it's "dark matter developers" as in "they never write blogs, they don't go to user groups, they don't tweet or facebook, and you don't often see them at large conferences." - https://www.hanselman.com/blog/dark-matter-developers-the-un...
Well, the code is just GPLv3 licensed small tools which I develop according to my own needs. Nothing impressive.
I don't use Twitter, Facebook and Reddit anymore. I just converse here, and with a Discord server I really like.