Write it, they will come.
Yeah, that just ain't happening. We are told as writers we need a platform, a way in which to promote and sell our work, and we're supposed to have it in place BEFORE we even get to the point of publishing our first novel. I say, what a pain in the hienie! That's a lot of pressure. And what do you do when most of your Facebook friends are more interested in building up their farmtowns and playing mofia wars than they are to listening to your writing dribble? (My friends love my writing dribble, right? RIGHT?)
Building a platform is a tough thing to do, especially with so many hopeful writers out there in the great big internet world trying to do the very same thing. So any information I can find I shall pass it along to you, my faithful writer/follower friends. (My non-writer friends, still follow me and love me despite my writerly ways).
Here is another link I found about why writers should build platforms and how to go about it (it has a little to do with the cartoon above, which is more accurate than you think). http://querytracker.blogspot.com/2009/06/building-your-platform.html