I really liked the story that Clive Thompson used in Chapter 3: Public Thinking of Smarter Than You Think when he talked about the successful blogger Kenyan-born Ory Okolloh and how she refused to write a book because she described herself as having "a very introverted real personality" (46).
Blogging is introverted? I guess I've never really thought of it that way, but I guess in a sense she is right--wanting to be published does involve having a little bit of an extroverted personality. You are basically putting your work out there for others to see. And blogging on the other hand is a little more private.