This has a safety net, its our little world that others in our life don't access. We don't have to worry about someone going and repeating what we say. Over all its not judgmental and even if someone is its not a big deal.
Sometimes people don't want to expose themselves to that type of vulnerability with people they know and see often. Here there is anonymity for those who are not confident. It is better than them not being able to ask real questions, plus, there are those of us who actually care about spreading the truth and helping others to see that they aren't alone.