Google analytics shows traffic as mostly direct and from Google; the next largest fraction coming from Reddit (I shared it a few times), and many from GitHub. I have never paid for advertisements.
The first time I shared it on HN it went to the front page :)
The first time I shared it on HN it went to the front page :)
https://news.ycombinator.com/item?id=17587992
ps - it's not essential, but I think many people use it for porn ;)