Duolingo's potential lies in its possibilities. Take this for example: If one million people used Duolingo to learn, the company says the entire English Wikipedia--some 4 million pages--could be translated in just 80 hours.

That's a win/win both for site owners looking to expand their reach beyond the English-speaking web, which the site partners with for translation services, and for those looking to learn a foreign language.

Duolingo currently supports English, German, French, or Spanish, and there are plans to add Portuguese, Italian, and Chinese in the near future. To start you off, the site offers basic lessons in your selected language, including words and grammar.

The nice thing is you won't be slammed with the hard stuff at first, and the easy translations come first, like "She is a woman," and so forth. As Duolingo detects increasing fluency in your selected language, the translation difficulty will also increase.