How successful is duolingo?

Related questions

1. What is duolingo meme?
2. Does duolingo have Farsi?
3. Is there Arabic in duolingo?
4. Is Rosetta Stone better than duolingo?
5. Which is better Pimsleur or Rosetta Stone?
6. How good can you get with duolingo?
7. What is duolingo English test?
8. Can duolingo work offline?
9. Is the duolingo owl a boy or a girl?
10. Can you retain information while sleeping?

Tags

1. #college
2. #concrete
3. #found
4. #hours
5. #tools
6. #learn
7. #effective
8. #semester
9. #takes
10. #duolingo
11. #suggests
12. #faster
13. #language
14. #learned
15. #learning
16. #stone
17. #something
18. #rosetta
19. #study
20. #lessons
21. #actually
22. #people
23. #equivalent