New York City is a multicultural melting pot where people from all over the world come live and work together. In some parts of New York, like in Chinatown, the culture of the people who life there is very obvious. You can see, smell, and hear the derivation. The same applies to Little Italy. You can tell where the people come from by listening and observing your surroundings, but where are all the other people? And which languages are spoken at all?
James Cheshire and Ed Manley mapped the languages that were spoken in Tweets in New York City between Jan 2010 and Feb 2013. It is a very interesting and impressive map of the cultural background in New York City. It gives an additional insight to the city besides the census data.