Yelp combines local reviews and social networking functionality to create a local online community. Adding social web functionality to user reviews creates a de-facto reputation system, whereby site visitors can see which contributing users are the most popular, respected, and prolific, how long each has been a member, and which have interests similar to theirs. Strong peer feedback mechanisms and the featured placement of popular reviews on the site and in local newsletters help motivate contributors. Yelp also applies a “First to Review” reward system to create a competition …

Satisfaction Unlimited makes a network of customer support forums where customers can post their own questions, idea, problems, or conversations about a product. They have seeded the network with boards for over 200 companies. If a company wishes, they can claim their company’s board and put their own employees on to moderate the boards.
Satisfaction was founded by Thor Muller (Rubyred Labs, Valleyschwag, Frog Design, Trapezo), Lane Becker (Adaptive Path, MeasureMap) and Amy Muller (Rubyred Labs, Valleyschwag, Violet.com and Frog Design).

GoodGuide™ strives to provide the world’s largest and most reliable source of information on the health, environmental, and social impacts of products and companies. GoodGuide’s mission is to help you find safe, healthy, and green products that are better for you and the planet. From our origins as a UC Berkeley research project, GoodGuide has developed into a totally independent “For-Benefit” company. We are committed to providing the information you need to make better decisions, and to ultimately shifting the balance of information and power in the marketplace.