I have a contest going on at Litsy (like instagram for books) where if people download it and post about my book they get entered to win some prizes. I have a fair # of followers on there (eamann), so any ranking I have is likely from that. If your wife isn't on there, I'd highly recommend it. It's like if people on twitter were friendly.
Awesome, thanks for the tip! We're mostly using traditional publishers now, but if we go back to self-publishing, I'll definitely work on building that up. :)
If you have any advice or experience on paid advertising, or any part of this self-publishing process, I'm all ears!
Not a TON that can be done now, really, since most need to be scheduled at least a few days (some a few weeks, or even months, if they're popular) in advance, but if it's running for another few days, a quick thing you can do is check out fiverr--there's several sellers on there that have huge followings on twitter, FB, etc., and you can get them to post it for $5-15 and see a lot of downloads, to help move it up the charts, getting more downloads (virtuous circle style).
Do you have a website with landing page/mailing list?
Are you planning on writing more after this?