Words and immersion
Other languages on DuoLingo offer a section where one can see a listing of learned words, along with one's relative strength in retaining each, in addition to a section called "immersion" where one can read and translate texts from that language. Are there plans to introduce these features for Esperanto? There are abundant texts (even if we simply relied on Wikipedia articles) to facilitate the immersion option. What's more, this would be a great way to reinforce learning through application.
I'm pretty sure this has been discussed before. As I understand it, a lot of these features are under the control of the Duolingo folks (not the Esperanto team). For example, I'm pretty sure the "flirting" lesson has been prepared by the team, but has not been released by Duolingo.
It's possible to trick Duolingo into showing you "words" for Esperanto. This involves opening up Duolingo in more than one browser window and switching languages on one of them. I can get it to show me Esperanto words by selecting German, opening a second window then changing to Esperanto, then going back to the German window and selecting "words". It shows me Esperanto words. I'm not sure what use that is, though.
There are also "unofficial" ways to do Esperanto immersion on Duolingo. Maybe this thread will be useful.
My thought, though, is that there are plenty of ways to work on Esperanto outside of Duolingo. If you enjoy translating Wikipedia articles, why not do that right on Wikipedia?