For book/ebook authors, publishers, & self-publishers
I'm on GoodReads, and I must say, it is one of the best sites to generate interest. I have great interaction on group discussions, made networking contacts, gotten good tips for marketing, blog followers, FB friends.
Stacy is right about not going there to sell, but in interact and become know. I been on other sites like Shelfari, LibraryThing, but GR has been by far the best. I look forward to discussions.
Author of Allon