This black and white grid is compilation of 10,000 tweets and is known as the NYC Twitter map. Programmer Eric Fischer wanted to run an experiment to see how active civilians of New York were using social media during their daily routines. The project extended from May 2011 until this January and Fischer used geotags from Twitter to construct his information.
The darker areas show the more tweet-sensitive spots which can be traced and hopefully recognized by viewers as spots that most social media bugs tend to gravitate too. Social media maps such as this one would be a great tool that businesses could use for marketing and product placement purposes. The NYC Twitter map is one of many for Eric Fischer and he wishes to find a way to get this information more quickly in the future.