Currently Being ModeratedAug 27, 2013 7:37 AM (in response to Pato17)
Terry is correct; at this time there is no way a user can block someone in iMessage. That will be a feature in the upcoming iOS 7 coming this fall; I'm not sure about it in Mavericks. Until that time, though, if you are receiving spam or abusive messages, you can report them Apple:
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