Why Should Writers Blog?

Desire M. Hendricks in her blog “A Conservatory of One: Exploring the Writing Craft and Llife” says it so beautifully:

There’s an immediate audience when blogging. Blogging also provides a sense of community via comments and linking. The solitary nature of writing is somewhat diffused by these qualities. Because of these things, I greatly enjoy blogging.

Two questions for my readers
Why do you write?

And if you also blog, why do you blog?