Ask HN: How do people keep finding my gem?

I've written a few programs, mostly just for fun, and never bothered to advertise them heavily. Nobody's paid attention, which is about what I expected. Then I wrote this:

http://rubygems.org/gems/groundwork

429 downloads right now. And I don't know how that happened. At first I figured, well, it shows up on the "recently added" list, but then they just kept coming. As an experiment I uploaded another one:

http://rubygems.org/gems/clean

And it had the lack of interest I'd expected.

So I guess my question is, now what? These 429 people like my thing, how can I find out why, so I can learn how to improve it, or make more things like it, or whatever? Nobody's following the project on Github, nobody's emailed me or anything. How do I get in touch with my users?