So let’s open up with the assumption that you have some people on your email list and these people are in your target demographic. Let’s add to it a simple premise: the people that they know are either also in your target audience, or very similar to them. Why? Because they are friends, peers and family members of your existing clients. Now, with those few little bits of information, you can build an enormous mailing list simply by giving something really cool away. Want to know how?