This is a great post on Social Media and the "Platform". I enjoyed reading it because it was active, interesting and gave me a different perspective on the concept.
http://www.pbs.org/mediashift/2013/02/guy-kawasakis-10-social-media-tips-for-authors045.html
Whether you're just beginning to build your platform or a veteran at social media, click on the link and read this.
I'm going to have more information on platforms and the importance of building a great one.
ciao
~LA