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Amazon has a very good model. User has to have an account <-This makes a person have to register an account use rCaptcha to weed out bot accounts) User verified purchase (can't review what you didn't buy from them) <- this prevents anybody from posting a review whom hasn't purchased it directly from Amazon or affiliates Report Inappropriate feature this allows users to report spam and the like, amazon then can look at the post and make a decision to remove it. Instead of looking at 1 million reviews a day you may only have to look at 10,000 spam reports. (example) This model only works if you have a lot of sales. If you're trying to build unique user driven content then this make not be the best solution. Hope it helps

DYNO Mapper is great at visualizing a website's structure. It is the best Sitemap Generator that I have used because it also performs a content audit and includes Google Analytics integration. It's pretty sweet how you can sort and filter pages based on Google Analytics metrics. If you are looking for a great discovery and planning tool I would give it a try. 110649952