Picking up the meme as generated by Prairie Mary, and expanded by Darko, I'll give the theme of Why We Blog a light twist and articulate three instances of how blogging has added value to my life:
1) It's made me funnier. I won't vouch for any improvement in my personality, but my wife recently commented that my writing has become funnier since blogging.
2) I've been introduced to the best books, thanks to blogging. People have left some terrific, and decidely off-beat reading suggestions in the comments. I've also picked up a few unexpected literary treasures by following links to this blog and reading blogged reviews of books the mainstream press can't be bothered with.
3) It has expanded my conversational range. Again: where would we be without blogger comments? I've had no lack of thought (and even action) provoking dialogue with people who were absolute strangers just three years ago. When it comes to friendships, we do what we can with what we have -- and blogging has opened up the range of possibilities in personally beneficial ways.
So why do you blog?