What was the first hashtag?

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Tags

1. #first
2. #technology
3. #proposed
4. #known
5. #twitter
6. #helped
7. #conferences
8. #august
9. #messina
10. #loosely
11. #using
12. #software
13. #organizing
14. #tweets
15. #organized
16. #series
17. #advocate
18. #hashtag
19. #which
20. #barcamp
21. #example
22. #concept
23. #pound
24. #create
25. #source
26. #chris