what these people are interested in and what comments they leave

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Data on the company's clients
Marketing specialists can collect data on existing customers from various sources. And most of them are also free:

Sales analytics. Analyze data from the CRM system , identify groups of customers with similar characteristics. Describe what products and how often they order, what amounts they spend.
Negotiation recordings. Listen to recordings of conversations between vietnam phone number list managers and clients or read the correspondence. Pay attention to what questions people ask, what concerns them most, what factors influence decision-making.
Website analysis. Google Analytics and Yandex Metrica web analytics services allow you to find out the gender, age and geography of your customers, where visitors came to your website from, what they are looking for, what pages they open and how long they stay on them. You can also find out what traffic most often converts into a purchase or other target action on the website.
Study social networks. Conduct an analysis of the brand group in social networks - VKontakte, Odnoklassniki and Telegram. See who is subscribed to the communities, This can be done manually: click "Show settings", go to the group statistics - there is the age, gender and geography of the participants. And you will find out their interests if you open several profiles of your subscribers on social networks. The same can be done automatically - using services for parsing the audience. For example, Cerebro or TargetHunter .

Support requests. This is the hottest information about what is currently worrying your customers. Collect statistics and analyze what are the main problems people contact you with, what questions they ask.
Company reviews. Create a brand page in 2GIS and Yandex Maps, use review sites. This way, active customers will start sharing their impressions of your product — this will provide information about its advantages, disadvantages, and factors that influence the purchase decision.
Interviews with employees. Sales managers, call center operators, store salespeople — all these people communicate with customers every day. They can tell you who is mostly interested in your product, what is important to them, what questions they ask, and what worries they have.
Customer surveys. You can survey customers when they register on the website, after completing a contract or sale. You can clarify personal data or ask questions to analyze product satisfaction, including using the NPS method .
Technologies allow conducting surveys very quickly. For example, you can post a question on social networks or send a questionnaire to your database. Another option is the Yandex Vzglyad platform , which allows you to set up an online survey yourself. You need to send a link to it to your clients. This is convenient, and you can ask up to 20 questions for free.