http://powerofcomparison.com/make-money-online-social-networks-marketing.html

You can make money with social networks like MySpace and Facebook in two ways- directly advertising or marketing within groups. For example there is a group of people interested in racing cars, they have specific problems questions and opinions so if you join this group and start conversation help somebody you gain respect and authority within this group and people start listening what you have to say and this way you can recommend them some products or services.