Consumers who rely on online review sites to plan their vacation might want to check with a professional travel agent before they pluck down their hard-earned money. Today, you can buy anything online, including positive reviews for your travel business. Just as the sharing economy has created websites that connect potential buyers and sellers of apartments, it’s also created some that connect buyers and sellers of personal services of all kinds. And on those sites lurk thousands of unscrupulous folks who will pay someone a few dollars to post some five-star comments about their products. Research shows consumers put a high value on review sites because they believe the reviews are credible and first-hand from people who actually used the product or service. To that end, Amazon in October made news when it sued 1,000 users of Fiverr.com, a freelance website where people offer to do jobs for as little as $5—including writing positive reviews of things they have never used. Often the suppliers actually wrote the reviews themselves; the freelancers simply posted them.