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FeedbackAny information you get as a reaction to your product which in turn you could use to improve your product is feedback. Analytics services, twitter following, instagram likes, youtube views .. everything gives a piece of information that can directly or indirectly help your product. There are various channels to get product feedback, here I'm listing some of the common ones.
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SurveysForms or questionnaires sent directly to customers or potential customers in hope to get a reply.
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PollsAnother form of survey but in a passive format that lets customers react quickly.
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Social MediaPublic presence and content can be used to gather reaction from followers. It also becomes a place for users to interact with products directly.
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ChatEngaging customers who land on your web page with a live agent chat.
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1-on-1 InterviewsInviting customers to have a more personal discussion about the product.
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In-AppPrompt users to let their voice heard while they are using the application.