The problem with publishing

If you post something online, it is published.

Unfortunately, what this means is that one has to stratify their ideas-- is this concept craft-worth? Something I'll work on and refine, revise and turn into something artistic and meticulous?
Or, is it just a blog idea? Something to post, think about, and move on from?

Originally, my nonfic was going to be blog-material, and my fic was going to be career-material. It's a silly notion that relegates nonfiction to a second-tier artform, but at least it's not arbitrary, like any other line I draw seems to be.

How do you folks balance the two pulls? Do you only post about yourself and your day? Or have you drawn other lines?