How is geo tagging done?

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Tags

1. #attaching
2. #location
3. #media
4. #videos
5. #information
6. #updates
7. #sites
8. #status
9. #process
10. #tagging
11. #social
12. #geographical
13. #digital
14. #tweets
15. #metadata
16. #communications
17. #photographs
18. #applied
19. #output