about sending private messages in users

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Hello.

I was wondering about the following feature. Do you think that is a good idea users being able to send private messages in other users/members of askbot?

A first, very simple implementation could be the following. I know that the admin of askbot is able to send messages/emails directly to any user he wants. So, functionality somehow is already there. It could be just available for all users and not only for admins.

What do you believe? Do you see any obvious problems such as private messaging doesnt support community spirit since users can start private chatting and not share information with all members and so on?