Sponsoring / Charity idea
This just came to me after a comment someone made in:
about actually buying rainforest.
It would be a neat thing if we could actually spend our lingots on charity, but for that to happen the lingot has to represent a monetary value. Which I think could be realized by having companies sponsor these special (maybe green-colored) lingots you could then earn and spend?
You'd earn them by doing exercises such as tests, finishing a skill, whatever is suitable and then after you've earned enough of them spend them on one of the charities provided by Duolingo at that time.
I don't need to mention all the great things we could do with them, but I don't know enough about the workings of an organization such as Duolingo to judge the actual merit of such an idea.
Anyway, just putting it out there!