Why does Reddit need moderators? Isn't voting enough?

Moderators help guide and create Reddit's many niche communities, which gives Reddit a diversity of viewpoints instead of having one monolithic overall community.

These communities distinguish themselves with a unique focus, look and rules, including what posts are on-topic there and how users are expected to behave.

One issue that often arises is that new visitors to a particular community aren't always aware of the rules that tie it together.

As an example, consider r/swimming and r/scuba. People can follow one or the other (or even both). Since scuba divers also like to swim, a visiting redditor might start submitting posts about swimming on r/scuba. If they are good quality, those posts would get upvoted by users who don't notice which community they're posted in.

This is where moderators come in and make sure that posts are on-topic, and ideally direct any off-topic users to a more appropriate community. Because if left unmoderated, r/scuba would become as general as r/swimming, leaving Reddit without a community focused specifically on scuba.

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