A study by the University of Massachusetts Dartmouth Center for Marketing Research reported on the adoption rate and use of social media marketing by Furtune 500 companies. The top 100 companies on the Furtune 500 list were more likely to maintain a company blog as well as a company Twitter account. (27% of companies ranked #1-100 have a Twitter account, while only 19% of companies ranked 401-500 are active in the microblogging community.)
The Fortune 500 companies are gradually adopting social media in their marketing practices. These companies, especially those in the top 100 are considered by many to be indicative of American business in general. However, previous data released by the center for marketing research revealed that more than half of the fastest-growing private companies in the U.S. used Twitter in 2009.
Source: eMarketer, March 5, 2010