No matter what you sell on the internet today – whether it is eBooks, products you have to mail out or services that you provide yourself – you need to find customers. That much is certain, but the more creative you are at finding those customers (especially when those methods don't involve spending any money) the more successful you are likely to be. That's why it is in your best interest to become familiar with social networking sites. Not to tell people all about what you do in your spare time, or to share the intimate details of your life with, but to use as a method to gain more business.