Changing public opinions for elections -
Big data can be used by the government to collect data about the opinions of the public. This knowledge can be used to then try to change the opinion of public by sending targeted messages to specific groups of people to manipulate what they think about certain topics. For example in 2016 US elections people who supported Clinton were shown targeted ads through means such as social media posts to try to sway their opinion to support trump instead. This type of knowledge about the opinions of public makes the government very powerful.
getting public opinions for policies
The government can collect opinions the public has about government policy. This allows the government to see what the public want, if they like the current policy and what they want to see changed. This can greatly influence government policy as they are put under pressure to change policies. For example the murder of a 6 year old by a 17 year old caused public outrage and then caused a change in policy by a judge.
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