Testimonial is simply a way of conveying assurance, in this case assurance is provided by the testimonial of the company or product/service in question in a written or spoken manner. A testimonial does not advertise the product freely unlike the role of the brand ambassador. A brand ambassador performs the function of a testimonial but a testimonial is not a brand ambassador. By simply providing a testimonial for a product/service, one need not be an ambassador for the same. For example, a customer can be a testimonial, since a testimony could be formal or informal "word of mouth" advocating the positive facets of the product. On the other hand, a consumer could not always be brand ambassador, since the latter is more commercial and is often considered as a position bound by monetary and professional liabilities. To a certain degree, celebrity endorsements provide testimonials for the product/service they are marketing. However, with the advent of the digital age testimonials have reached an all-time high. A large number of websites feature a "go to" tab where one can put down reviews or testimonials for the product/service. This has led to an increase in fake reviews, where companies have chosen to pay people to get their positive feedback. According to a study conducted by the research firm Gartner, "one in seven reviews/testimonials posted online by the end of next year is likely to be false. Other estimates put the number as high as one in three.