It was a sales call from the Internet company.

It means that you register some keywords about real estate in their company.

The meaning of the keywords is: For example, if you go to Baidu to find real estate information and make real estate in "Dongcheng District", the three words of Dongcheng District are the keywords you want to search for real estate information.

You may have left a contact number when searching for real estate information on some websites before, so the website sets you as interested customers who want to register a property keyword, so call to sell it to you.

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