This is http://stackoverflow.com/faq’s karma points policy:
Amass enough reputation points and Stack Overflow will allow you to go beyond simply asking and answering questions:
15 Vote up
15 Flag offensive
50 Leave comments†
100 Vote down (costs 1 rep)
100 Edit community wiki posts
200 Reduced advertising
250 Vote to close or reopen your questions
250 Create new tags
500 Retag questions
1000 Show total up and down vote counts
2000 Edit other people’s posts
3000 Vote to close or reopen any questions
10000 Delete closed questions, access to moderation tools

† you can always comment on your questions and answers, and any answers to questions you’ve asked, even with 1 rep.

At the high end of this reputation spectrum there is little difference between users with high reputation and moderators. That is very much intentional. We don’t run Stack Overflow. The community does.

I want to build something just to implement a similar point set.

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