I’m a female developer, working in the industry since 1997. I use StackOverflow and its siblings regularly. I created an account because I wanted to be able to upvote answers I found especially helpful, only to find I couldn’t do that without posting answers first myself, so I rarely actually log in. I don’t have time to look for unanswered questions that I might know the answer to, much less figure out if they duplicate already-answered questions. Maybe others are willing to post repeat answers to already answered questions; I’m not going to waste my time that way. So for this female developer, the entry process for participating in the StackOverflow community is too strange and inconvenient an obstacle.
While I read something or other on the site nearly every day, I wasn’t even aware of this survey.