I have no idea about the truth to this tale, but I read about an author who wrote a blog post about his current struggle with depression. I heard that after a few days, his agent made him pull the post. If this is true, it makes me sad.
As a reader, I want to know about authors. I want to know what they're like, what they do for fun, where they've been. I want to know that they put their pants on, one leg at a time, just like the rest of us. I could care less what month is your worst for sales or how much an advertisement cost you. I don't want to read one thousand links to your book on my twitter feed. I want to hear about you.
I want to hear about more than just your writing process. I want to read about your life. I want to read about your victories and your struggles. Our struggles connect us to people. It makes us feel that we are not alone in our misery. If you're depressed, or having a bad time with something, it's okay to post about it. You're not going to turn your readers away by revealing your human side to them. In fact, you might find that your readers will invest more into you, if you open yourself up to them.