Goodreads Authors/Readers discussion

Question for readers: If you own a Nook or Kobo, where do you go to find out about books offered for your reader? Are there sites that cater primarily to Nook or Kobo?

Question for authors: If you're offering your book(s) on Nook or Kobo, what do you do to connect with owners of those readers? Have you found anything like Kindleboards (or the zillion other Kindle-specific sites) for Nook/Kobo?