I think that only applies in the context of Q&A -- if you have a blog entry that's along the lines of ...
I had this problem, and it sucked! I'm going to document the solution I found, at great personal cost to my sanity, so nobody else (including, and most of all, myself) has to suffer like that again!
... and not ...
I'd now like to share an undirected, rambling rant about topic X with you
... then it's a good fit. For example my latest blog post is a fairly good fit to Q&A, where Q is
Why don't the emails I send from my code reliably arrive in the mailboxes of the users I send them to?
The answer is kinda long, though, which makes it a better fit for a blog entry than a direct Q&A. I will, however, definitely be referring the many SO users who have that question to this blog entry!