I think I know who you're talking about - the author who promos through blogs and such? Builds herself a relationship with the blog and the people on it? I wish I were a tenth as successful as she apparently is:)
Nowadays the author is expected to promote herself. Extasy does do promo and gets their authors reviews, but as far as I know, all the ebook places expect the author to self-promo. I did more in the beginning than I do now. It's very time intensive and doesn't always win readers the way you'd hope. Good Reads is popular, I think, as an author hangout, where you can publish reviews and link to blogs, etc. I submit my work to get reviews for my works, promote here and there and let it go (not what publishers want and expect of the author, I'm afraid). I have a website, a facebook account, and a twitter account. I've found almost no venue to appeal to Amazon's readers, personally. I seem to do better there than elsewhere, where I frequently sink like a stone:)

Worth noting that most epublishers send out their catalog to 3rd party sellers, where you'll get some exposure but less money.

Also worth noting is that I've heard that ebook publishers sometimes have much less in the way of edits than you'd expect. That was not the case for me at eXtasy - I was edited quite thoroughly.