Blogs are just a front porch. Blogging to the inside is about building relationships, but it is also about perpetuating dialog. A blog lets you put your idea out for everyone to see. It is like the ultimate suggestion box.
Blogging as (imaginary?) public correspondence I've been thinking that blogging, at least for me, is a kind of act of writing correspondence, but with the relatively weird properties that I am not writing these posts to a specific person or group of people, and I am not strictly expecting corresponding posts in response.