Learning from blogging
I've become very comfortable with expressing myself quickly and clearly, and I'm much more confident about expressing a clear opinion, tolerating its being challenged, debating it and supporting it - or dropping it and learning from criticism. Networking, building on others ideas, sharing my own and letting go of my ideas as they join up with others and are used by others. Though I suppose universities want to or should teach these things, I sure didn't learn them in seminars, lectures or writing groups. Perhaps others did.
I learned that from playing online role-playing games - from mudding. Perhaps what we learn from is being social while limited to writing?