The best site to learn Japanese by: levels, text, with the rating of learners and word quiz SRS?
Few month ago I found the grat web-site to learn Japanese.
It has a registration, after you have your own account, where can see your progress and rating among the other learners.
You can choose the words by level or etc. options. read the text was added by other people on this web-site and learn words from this texts. It's more like good community with SRS syrtem to repeat what you've learned.
I remember only it was black coloured interface :D I strongly to find it, but I have searched already 3 hours on Google, and still have nothing. Probably someone who learn Japanese know what it is.