What is the meaning of TBT on Instagram?

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Tags

1. #hashtag
2. #platforms
3. #instagram
4. #their
5. #internet
6. #throwback
7. #facebook
8. #trend
9. #thursday
10. #pictures
11. #media
12. #accompanied
13. #users
14. #often
15. #social
16. #among
17. #nostalgic
18. #throwbackthursday
19. #twitter
20. #popular