PaulineMRoss
Inkling
I also noticed when one of your books was for free, you mentioned it on reddit and got loads of responses. I've posted some there, but it's probably right below Facebook and Twitter for places I frequent the most (besides this forum).
Yeah, I was surprised by the level of interest. And several of them went out and bought all three books, not just the free one, which was amazing. They're a great bunch of people, and very open to self-pubbers, so long as they don't spam the place with self-promotion. But announcing a discount or freebie is fine.