There's certainly no shortage of everyman opinions in this world, but on the web, they're more organized. In fact, there are online communities dedicated to collecting and publishing the opinions, recommendations, and reviews of average Joes and Janes on everything from hotels to laundry detergent. These communities generally welcome anyone willing to offer a thoughtful thumbs up or down, which adds a layer of user-generated content that is still evolving and often controversial. Here's what you need to know to get the most from these websites, and, if you're so inclined, add your two cents.