What does hashtag TBT mean?

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Tags

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