How effective is duolingo in learning a language?

Related questions

1. How do I get duolingo plus?
2. Can adults learn a new language?
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4. How many hours does duolingo take?
5. What is duolingo coded in?
6. Is Babbel better than duolingo?
7. How good is duolingo?
8. How does duolingo plus work?
9. Which is better duolingo or Memrise?
10. Can you really learn Spanish with duolingo?

Tags

1. #single
2. #duolingo
3. #comparative
4. #something
5. #faster
6. #because
7. #teach
8. #reading
9. #language
10. #concrete
11. #choose
12. #consider
13. #learning
14. #important
15. #before
16. #people
17. #found
18. #study
19. #effective
20. #learned
21. #tools
22. #actually