Opinion, refers to the generation, development and change around events within a certain space of social influence. Public opinion is not a simple regular generalization of public opinion, but is a comprehensive social attitude held by the public as a participant towards the involved parties' objects and their policy directions. At the same time, it is also a manifestation of the beliefs, emotions, opinions, and attitudes expressed by a larger number of people about various social issues and phenomena.

Personally, I suggest that online public opinion monitoring should look for good efficiency. Sina Public Opinion is a big data service platform for government and enterprise public opinion developed by Shanghai Mito Information Technology Co. Based on Chinese Internet big data and official data from Sina Weibo, Sina Public Opinion collects 11 major sources of information from the whole Internet, including news, newspapers, government affairs, microblogs, public numbers, blogs, forums, videos, websites, and clients, 24 hours a day, and collects more than 140 million pieces of data every day.