What does DM and PM mean?

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Tags

1. #tweet
2. #update
3. #twitter
4. #phrases
5. #internet
6. #short
7. #computer
8. #multiple
9. #messaging
10. #abbreviation
11. #including
12. #private
13. #there
14. #direct
15. #definitions
16. #social
17. #message
18. #following
19. #person