What is op on Reddit?

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Tags

1. #acronym
2. #created
3. #anything
4. #answer
5. #questions
6. #popular
7. #threads
8. #redditor
9. #occupation
10. #poster
11. #about
12. #subreddit
13. #where
14. #their
15. #thread
16. #usually
17. #another
18. #reddit
19. #redditors
20. #original
21. #initial