Can you really learn language with duolingo?

Related questions

1. What is b2 English level?
2. Is 110 a good Toefl score?
3. What does b2 English level mean?
4. Has anyone become fluent with duolingo?
5. What is an ELP level?
6. What is English business level?
7. How can I get 6.5 band score in ielts?
8. What is an English language proficiency?
9. What is a b1 test?
10. Is it hard to get 6.5 in ielts?

Tags

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17. #language
18. #suggests
19. #rosetta
20. #people
21. #hours
22. #learn
23. #learning