eMarketer released some survey data detailing how a sample of users use both Twitter and Facebook. The most surprising thing to me about the results is similar the outcomes are.
Taking a look at the data sets below the percentage of Generation X users and <35 claim about 70% use it for staying in touch with friends, 35% use it for staying in touch with family and about 10% use it for staying in touch with co-workers.
eMarketer Facebook Data
eMarketer Twitter Data
From this data, it’s not unreasonable to draw the conclusion that Twitter and Facebook are competing for the same data and validate Facebook’s conclusion that Twitter is a true threat to the Facebook hegemony for user attention.