This February 2004 study from Pew Research Center finds that, as of a summer 2003 survey, some 2% of the online U.S. population blogs. The study also notes that early data from 2004 indicates that figure may have gone up to as much as 7% of the population. According to my analysis, as laid out in greater detail in an article I wrote for iMedia, that 2% and 7% works out respectively to 2.5 million to 8.8 million people, based on Pew’s Deceber 2003 estimate of 126 million U.S. adults online.
The report looks at a range of people’s online activities, but if you prefer, you can skip right to the section on weblogs.