The study was largely based on random telephone surveys of 1,555 Internet users taken from March 12 to May 20, 2003. The margin of sampling error is plus or minus 3 percentage points. That survey found only 2 percent of users keeping blogs, although a preliminary analysis of follow-up surveys from early 2004 showed the figure increasing to about 7 percent.

[ Yahoo! News ]

The Pew Internet and American Life Project clearly has missed some important rules to gathering data. You don't phone up people and ask them about their blogging activities. Folks who blog are far too busy to answer the phone, if they even have a phone. Maybe they should start a blog, and then we'll all comment on their blog, and then they'll have the data they need. Personally, busy or not, I don't answer the phone if it says “Unknown caller” or whatever my cell phone reads, and I haven't had a land line in years...