I assumed from his writing that he was female. I just now followed some links to his website and realized that I was wrong. I went back and read the piece where the protagonist seemed female (to me) and even though, in the comments, the author had used "he" to describe the character, I had somehow missed that - so convinced I was of the character and author's gender.
When I saw the character as a boy not a girl, the story seemed a little different -- but it really wasn't. My opinion of the writing did not change. I was just a little stunned at my own assumptions.
Of course I knew that 95% of active Hubski contributors (from a study six months ago) were male and I usually assume that everyone (with some notable exceptions) are male - still I was surprised at my mistake.
Someone referred to me as "he" in a post some time ago. I was amused.
What about you?
Have you assumed the gender of an author on hubski or elsewhere only to discover you were wrong?
Can you tell from a person's writing if they are m or f or some variation?
Do we co-create an identity for other people if they are minimally self-presenting?
Did you deliberately choose a gender-ambiguous online name? Some of the people I follow have, what I would describe as a womanly name, even though I KNOW this person is male.