I'm working on a project that I believe a lot of people will be interested in. I've posted about it here a few times. I don't have money for advertising, but I'd like to get the word out. I know that this is an obstacle that a lot of people face.

I'm using Google+, Facebook, Twitter, and Instagram, but... I don't have many followers on any of them. I'm starting from the ground up.

I want to get the word out, but I don't want to be obnoxious about it. Almost all of my marketing experience is in traditional media (print, radio, TV). That doesn't work for a zero-budget project.

I want to get the word out, but I don't want to spam.

What are your suggestions?