If You want to have Your Ebook FOUND spend more time on Searching for the Niche communities and placing an excerpt from the ebook in a current discussion(just like in a Sunday Salon of yesteryear) and then make a condensed FreEbook available as an appeteaser, which carries a link(at the bottom page) to the Ebook(hopefully as a gift) .
Make absolutely sure that about 1/3 into the ebook and FreEbook that an invitation to review and discuss the subject matter is included.
This method has worked on two notable projects. CSFTS, 101 Stories etc(circa 1994) and Vegan Fusion(circa 2008) so is based on actual experience and not some SEO big data warehouse theories.
And then we have the Ebook4Good edition which comes with Hangout support here http://bit.ly/SocRespEbook2013
Or As a Gift For Your Socially Aware Community Writer, Author, Self Publisher or Activist http://bit.ly/EbookNicheGiftSW2013
Please consider joining our Google + community for weekly Hangouts4Good http://bit.ly/Ebooks4Good