BzzAgent sends you free products based on your lifestyle and family. In exchange you have to review it. This is called a campaign. There are many ways to review. You can do face to face, on your blog, on Facebook/Twitter, and reviewing right on their website. You are also given coupons to share with your friends when you talk to them about the product. They more ways you share, the higher your BzzScore the more likely you are to get more items. They encourage telling people about the product as many ways as you can. This is called spreading the bzz. Hence, they are called BzzAgent.
The downside to BzzAgent is that you don't get to choose which campaigns you are going to get. You may see one and wonder why you didn't get chosen. Everything is based on your answers to survey questions that they use to know what campaigns would fit you. You do not have to accept everyone they invite you to join but you also can't ask to join one.
Some of the things I have received have been: frozen pizza (coupons to pick up), a razor, and air freshener. In fact, expect to see reviews on some of those soon. :) But I have seen campaigns for everything from hair color to yogurt to cereal to cosmetics. It can be a nice way to try a new product for free. I even got the air freshener right when we ran out in the house. Perfect timing!
Check it out. There is no referral, no teams. Everything is dependent upon your involvement.