What triggers Captcha?

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Tags

1. #automated
2. #malware
3. #caused
4. #computers
5. #infected
6. #traffic
7. #processes
8. #through
9. #tools
10. #going
11. #triggered
12. #search
13. #routers
14. #sometimes
15. #computer
16. #ranking
17. #explains
18. #viruses
19. #google
20. #captcha
21. #worms
22. #proxy