How are websites chosen for translations?

I noticed that some articles that are translated are from the same websites. I have yet to seen a website such as Wikipedia or a major website such as Twitter or Facebook. How are these websites chosen? Is this how duolingo makes their money??????

February 7, 2013

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They intend to make money that way, but as for now they're doing it for free. As for how the sites are chosen, I have no idea.

Spanish, at least, does have some translations from Wikipedia:

February 8, 2013

Yup. I have done some from Wikipedia in Spanish.

February 8, 2013
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