MIT Study On Twitter’s Growth

MIT researchers who studied the growth of the newly hatched Twitter from 2006 to 2009 say the site’s growth in the United States actually relied primarily on media attention and traditional social networks based on geographic proximity and socioeconomic similarity. In other words, at least during those early years, birds of a feather flocked — and tweeted — together.

NewYorker Piece On Twitter

To start with, the audience is alarmingly fickle. Nielsen estimated that user-retention rates were around 40 percent. Twitter was easy to use at an entry level, but after a while it was hard for some people to see the point.