Do you mean private messages? Private messages have been suggested already and the Administrators said no. You can read more about it here: http://scratch.mit.edu/forums/viewtopic.php?id=20075
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This has been suggested before, but so far it has been rejected because the Scratch Team doesn't want people to be sending innapropriate or spam messeges to others. It would be extremely hard to monitor all of the messeges and would just be a bother to them.
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