Is duolingo effective for Japanese?

Related questions

1. Is Rosetta Stone better than duolingo?
2. Can you become fluent in a language in a year?
3. Can you retain information while sleeping?
4. Does duolingo offer certificate?
5. What is duolingo English test?
6. What is duolingo meme?
7. Is the duolingo owl a boy or a girl?
8. How successful is duolingo?
9. Does duolingo tell you how fluent you are?
10. Can duolingo work offline?

Tags

1. #language
2. #foreign
3. #japanese
4. #courses
5. #there
6. #effective
7. #duolingo
8. #first
9. #kanji
10. #mostly
11. #hiragana
12. #usually
13. #learning
14. #recommend
15. #using