What is an important drawback of using text generated by consumers on social media for a marketing research study? Choose one best answer: 单项选择题
A
In most cases, the sample opinions that can be collected on social media is too small
B
Text data generated by consumers on social media are unstructured and cannot be used for analysis by machines
C
The group of consumers who expressed their opinions on social media may not be representative of consumer population
D
Collecting data on social media is more expensive than conducting a survey by phone
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