Writers are often told they "need a blog" to "get known" or promote themselves or their book, but I find that it doesn't work that way. It can't work that way when every writer has a blog and every blog has a writer. I've been writing two blogs, including this one, since 2007, and for various reasons and under various names have started 5 others, 3 of which still serve a purpose, and admit I spend a lot of time on them; if not writing, then reading them, because I'm fascinated by what I -- or my pseudonyms, because only two blogs run under my real name -- have written over the years. Some the blogs include photographs or videos. I write them only when I'm inspired to do it and work at making them good.
Should the energy going into blog posts have gone into poems or other literary work? And I realize that isn't a question. A writer should write whatever he or she likes. I'm far more eager to write blog posts and articles than I am to write poems that, like children, need not only to be born but need to be brought up and disciplined like a ballerina and then sent out to flutter and starve and freeze in a blizzard of poems, a wintry world in which everyone is his own favorite poet. Or a poem is like a single chip in a casino, one bought and played at great emotional expense, while knowing the house always wins. And you know what? Nobody cares what you write but you. The future of authorhood is everyone writing his or her own book and being its only reader. Technology is making that truer by the minute. And truer than ever are those old chestnuts that the only reason to write is because you enjoy doing it, or if you are driven to do it, or if you get paid for it. If you blog to "get known" or "get your work out there," that's what's futile now.