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i think you think too much.
You can pretty much do that in a thread, it's not strictly one to one, anyone can join in, but there's nothing to stop you starting a thread and discussing it with one other person there. I don't think the team behind the site will want to encourage people to post privately, it'd undermine what they're trying to do. It's very much about the group.
thats what this little reply box on the bottom right is for, so that you can interact and ask questions and communicate back and forth with each other.
If you mean a "private" chat, then no. That is not what is needed in this type of environment.