Market Segments 15.1 to 15.4 covered the customer who gets in touch. This Market Segment covers the customer who doesn't, and the one who tells everyone else instead. It holds three kinds of software, which all answer the same question: what do customers think of the company?

What people say about a brand on social media is covered in Market Segment 13.4, PR, media monitoring and social listening tools
This is a small Market Segment, with seven companies. Every company named here has posted software engineering jobs in India. Famous companies that don't actively hire software engineers in India are left out.
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Reviews on the product page. Take the shampoo reviews from the start of this Market Segment.

Reputation for businesses with many branches. Now take the one-star review of the dental clinic from the start of this Market Segment. The chain's head office wants to see it, and every other review of every branch. The industry calls this reputation management. Its buyers are businesses with many locations, such as a chain of dental clinics, a car dealer or a hotel group.
Feedback read in bulk. The last two companies read feedback rather than reviews. Take the 1-to-5 rating from the start of this Market Segment, and every other comment a company receives.

Surveys used for market research, such as SurveyMonkey's, are covered in Market Segment 13.6, Survey and consumer research platforms
Trustpilot and Qualtrics are not covered in this Market Segment.
A survey asked a few customers a few questions. Now a model reads everything customers have already said, in tickets, reviews and calls. It finds the common themes without anyone asking a question.
Who these companies hire, and for what, is on What customer service and CX companies hire for.