Why do we need Unicode with Ascii?

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2. #unicode
3. #characters
4. #their
5. #would
6. #around
7. #internet
8. #global
9. #across
10. #companies
11. #google
12. #facebook
13. #character
14. #because
15. #different
16. #users
17. #commonly
18. #languages
19. #world
20. #represent
21. #ascii
22. #communicate