Why do pictures upload sideways?

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Tags

1. #editing
2. #would
3. #sideways
4. #appear
5. #using
6. #itself
7. #upload
8. #reason
9. #viewing
10. #because
11. #computer
12. #photo
13. #software
14. #orientation
15. #rotate
16. #vertically
17. #image
18. #taken