Why is Wikipedia not a reliable source?

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Tags

1. #contains
2. #sources
3. #wrong
4. #could
5. #particular
6. #wikipedia
7. #primary
8. #anyone
9. #information
10. #source
11. #edited
12. #which
13. #progress
14. #generally
15. #reliable
16. #secondary
17. #plain
18. #means
19. #vandalism