This is my first time experimenting with a WP.com blog, and I am having trouble understand the system for signing people up as contributors. I would like them to be able to have simple user names like 'Bill' and 'Sandy', but when they register it seems they have to have a unique username, that no other WP.com users have.
Is that really the case? If so, it's a bit nuts.
Is there a FAQ about this, or some kind clear documentation about users and usernames?