The world of publishing has changed dramatically in the last decade. To succeed as a writer today, much more is required. Whereas publishers used to do most of the advertising for a book, today the writer is responsible for most of the promotion.
Promoting your book involves building your author platform because it is through your author platform that you will sell most of your books. So, what is an author platform?
An author platform is the launching pad for your promotional efforts. It includes many venues, such as print media, blogging, Facebook, Twitter, YouTube, and a host of other outlets. It also includes your author persona, that portion of your life that you are willing to share with the public.
In order to promote your book, it is important that you maximize these venues to let people know of your work. While your publisher will do some promotion, the bulk of it is up to you.
For more excellent information on building an author platform, I refer you to the following book by Jeff VanderMeer entitled BookLife: Strategies and Survival Tips for the 21st Century Writer :