In other words I am rather skeptical about DuoLingo. I am worried about how much it will treat you as a language learner rather than human capital and that its screwing with translating work, something that is not easy. In ways this almost pisses me off because although translating web articles and factual information may be ok because its objective most of the time, but what about subjective material such as novels (and/or manga)? How many language learners will be able to accurately translate not only the words but understand the exact feelings the author wants to express whilst trying to make it as natural as possible in one’s own native language?

personally what i would do is to thank them by correcting their journals and saying something like さっきの添削ありがとうございます

lang 8 profile link?