Answer: People may choose to be anonymous because they don't want others to know who they are, or find their personal socials. People who are often anonymous tend to bullying others online, and would rather be behind a fake profile so other people don't know their real life and who they really are. Some people may also use it so people don't know who they really are, so they can express themselves online without people they know, knowing its them. Maybe they are into something odd that people may judge them for, so its much easier to hide behind a screen than face it head on. It won't really benefit them, but it allows them to share things about themselves and express themselves online without their personal life being includes.
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