For book/ebook authors, publishers, & self-publishers
Press Releases, properly written and targeted, can be a great plus, and essential in your promotion efforts.
Need Press Releases?
If the answer to the subject line is "yes," consider http:/prlog.org (there are others, but they have been very good, per our experience).
Check out this one on my IndieGoGo project. It was picked up on Google, Yahoo, Bing and others within a few hours. It was published on Sunday, September 14, 2014 and already has more than 6,000 hits in one day.