What is the point of a hashtag?

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Tags

1. #topic
2. #users
3. #indexed
4. #message
5. #searchable
6. #keyword
7. #hashtag
8. #identify
9. #becomes
10. #social
11. #phrase
12. #within
13. #preceded
14. #other
15. #facilitate
16. #their
17. #network
18. #whenever
19. #interest
20. #discoverable
21. #search