Are CAPTCHAs effective?

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Tags

1. #secret
2. #captchas
3. #write
4. #hobbyists
5. #captcha
6. #pocketbook
7. #commercial
8. #highly
9. #accuracy
10. #companies
11. #regularly
12. #vulnerable
13. #effective
14. #appeared
15. #degree
16. #sites
17. #where
18. #solve
19. #their
20. #internet
21. #thwarting
22. #spammers
23. #several