Platforms Effective?

I use this blog as a "platform" and I have Facebook, but only as a "platform" but I'm not sure just how effective they are or will be as "platforms." Sure more people know about me and my books now than before I did them. But how will that translate into sales?

Since my books are not even available right now, that's impossible to gauge. I suppose I will have more sales than I would otherwise. I'm just not sure if I started this blog and FB too soon. I mean I started this blog a year and a half ago. It was when I was writing KILLER EYES. Then I went back and did some more revisions on THE VASE. Then THE VASE sold. Then it sold again. And that's a good thing, but it wasn't because of the blog or FB.

But when you are submitting, the publishers are typically glad that you have some kind of "platform" and blogs are at least a beginning. So, again, we'll see how it all pans out.