Just saw this on CNN:
More than three-quarters of Americans – 76 percent – said they use the Internet, but only 26 percent said they were “very familiar” or “somewhat familiar” with blogs. Just 7 percent of adults said they read blogs at least a few times per week, according to the CNN/USA Today/Gallup poll. Forty-eight percent said they never do.
Still, over 15 million people is pretty good for a media format.