New top story on Hacker News: Ask HN: Where and how do you find your early adoptors. What worked? what didn't？

Ask HN: Where and how do you find your early adoptors. What worked? what didn't？
20 by zhangruinan | 16 comments on Hacker News.
I have been working on my side project (a productivity tool) for the past 5 months. I want to find some beta users for my software. With very limited time and resources, how and where can I find my first 100 beta users?