Amazon allows users to submit reviews to the web page of each product. Reviewers must rate the product on a rating scale from one to five stars. Amazon provides a badging option for reviewers which indicate the real name of the reviewer (based on confirmation of a credit card account) or which indicate that the reviewer is one of the top reviewers by popularity. Customers may comment or vote on the reviews, indicating whether they found a review helpful to them. If a review is given enough "helpful" hits, it appears on the front page of the product. In 2010, Amazon was reported as being the largest single source of Internet consumer reviews.[123]
The company has also invested in a number of growing firms, both in the United States and Internationally.[67][68] In 2014, Amazon purchased top level domain .buy in auction for over $4 million.[69][70] The company has invested in brands that offer a wide range of services and products, including Engine Yard, a Ruby-on-Rails platform as a service company,[71] and Living Social, a local deal site.[72]
Amazon runs data centers for its online services and owns generators or purchases electricity corresponding to its consumption, mostly renewable energy.[139] Amazon contracted with Avangrid to build and operate the first wind farm in North Carolina to power Amazon's Virginia data centers. The wind farm was built and began operating in December 2016 despite opposition from President Trump and some North Carolina Republican legislators.[140][141][142][143][144]
The Amazon sales rank (ASR) provides an indication of the popularity of a product sold on any Amazon locale. It is a relative indicator of popularity that is updated hourly. Effectively, it is a "best sellers list" for the millions of products stocked by Amazon.[134] While the ASR has no direct effect on the sales of a product, it is used by Amazon to determine which products to include in its bestsellers lists.[134] Products that appear in these lists enjoy additional exposure on the Amazon website and this may lead to an increase in sales. In particular, products that experience large jumps (up or down) in their sales ranks may be included within Amazon's lists of "movers and shakers"; such a listing provides additional exposure that might lead to an increase in sales.[135] For competitive reasons, Amazon does not release actual sales figures to the public. However, Amazon has now begun to release point of sale data via the Nielsen BookScan service to verified authors.[136] While the ASR has been the source of much speculation by publishers, manufacturers, and marketers, Amazon itself does not release the details of its sales rank calculation algorithm. Some companies have analyzed Amazon sales data to generate sales estimates based on the ASR,[137] though Amazon states:
The legendary red logo that you’ll see on all of the products in our As Seen On TV shop is now recognizable Worldwide, and was originally designed by A.J. Khubani, CEO of Telebrands, a company that has sold hundreds of millions of ASTV products. The logo is actually unprotected, which turned out to be a good thing as it allowed the industry to explode. This means that anyone can use the AsSeenOnTV  logo on packaging and in trade without the risk of infringing on someone else’s trademark.
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