Is there any good business justification for allowing a User to send a Private Message to Multiple Recipients at once??

I say NO, and here is why...

a.) To me, a "Private Message" implies a certain degree of intimacy between two people, versus things like E-mails or Tweets which somewhat imply "broadcast"...

b.) Allowing a User to PM several Other Users at once opens up a big liability - in my mind - by making it easy to spam other Users!!

c.) It adds unnecessary complexity to the Application and Database Design.

What do you think?