How reliable is Alexa?

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Tags

1. #assured
2. #however
3. #dubious
4. #drawing
5. #accurate
6. #naturally
7. #sample
8. #traffic
9. #lower
10. #alexa
11. #among
12. #sites
13. #system
14. #ranking
15. #source
16. #those
17. #gives
18. #greater
19. #accuracy