I just got two people I don't know join Duolingo!
I was playing the game Our World and I started talk in German. I got talking to these two girls who was asking what I was saying. I told them I was speaking German and I also know some Spanish. I asked them if they wanted to know how I was learning German. They said yes. I told them. The two girls said they wanted to learn Portuguese and Spanish. In a few minutes I got they signed up. I added them so if they needed help. If I didn't start talking in German they would have never signed up. I feels so great to help people and tell them about Duolingo. Thank you Duolingo for all your hard work!
That's a cool Story! I have one too! Once I was on the tram on my way home and heard some University students in Dresden - they might have been from Marocco (a man and a woman) - talking about learning languages/learning German. They tried to recommend different things to each other and ended up saying Rosetta Stone is too expensive for them. So I simply went up to them, told them about duolingo, wrote it on a piece of paper and made them happy with it (learning a language for free!) This way I got at least 10 people to sign up already (well, at least I hope they did) :D :P