Well, there`s a difference between two words: "famous" and "notorious." There also are lots of celebrities who seem to be celebrities for no reason whatsoever other than the media has made them recognizable.
Would you say that Paris Hilton is an entrepreneur? She created nothing, does nothing, apparently is quite ignorant, and certainly has no concept of the Hilton hotel chain. And yet mention her name, and everybody seems to know who she is and what she looks like.
Does that make her an entrepreneur? Is she famous? Will kids in school, 50 years from now, read about Paris Hilton and how she affected civilization in some way?
She also makes and has made a fair amount of money by being Paris Hilton, which is similar to a brand. Her product is nothing, and the only reason it sells is because people are fascinated enough by her meaningless existence that they`ll pay to watch the possibility of her "career" being found out as nothing.
People who make money blogging aren`t entrepreneurs. They`re writers and authors who`ve entered into the new distribution and publishing channel of the Web. The entrepreneurs are the creators of things like WordPress, TypePad, and the blogging software itself.
Those who use the entrepreneur`s product are actually the entrepreneur`s target market. Then someone like Google comes along with an entrepreneurial idea to combine and consolidate ALL blogs, and that`s a new, creative idea.
The essence of entrepreneurship is to develop something new. Either a new product, or a new way of using an existing product. Blogging isn`t a new way to of using blog software. Writing interesting content on a blog isn`t a new way of writing (although in today`s world it`s surprising).