PowerReviews, a company that provides customer review technology for retailers and e-commerce sites, has raised $10 million in new funding led by Four Rivers Group, with Woodside Fund, Menlo Ventures and Tenaya Capital participating in the round. This investment brings PowerReview's total venture funding to $37 million. PowerReviews, which launched in 2007, provides retailers and brands with the ability to collect, organize and analyze comments and other user-generated content.