BzzAgent is a site that allows you to try products out for free. You, in exchange, post your opinion of that product on social media sites. It is a great way to try new items and give your opinion about it at the same time! You can post your opinion via Twitter, Facebook, via the actual site, etc.
Products do not come too often, however. Members are known to have gotten 1 to 2 products every few months, on average. Filling out profile surveys are also needed to boost your BzzScore so that you have better chances of getting into campaigns. If you like free products and like social media, this is the site for you!