REVIEWS
Can you imagine what the Internet (and life in general) would be like without consumer reviews? Reviews are so powerful in influencing buying decisions that most people won't purchase anything without reading about other consumers' opinions and experiences first. Although most reviews are unsolicited, we always find great relief in knowing that other people have tried certain products and services before we did. We learn "what it's like" before spending our hard-earned money.
I can't tell you how many times I've bought products and hired services just by reading reviews posted by other people. But I assure you I've done it so many times, and with a lot of success.
The more we know about the products, services, and deals we buy, the better the choices we make on our purchases. When we share our reviews using social media, we also empower our entire community.
GREAT RESOURCES:
http://journalism.about.com/od/writing/a/reviews.htm