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Remember how on iChat you could block certain people or just allow certain people? Is there a way to do that on iMessage?

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marked as duplicate by bmike Sep 19 '13 at 0:49

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

    
Are you asking about iMessage as a service for iOS and OS X, or the Messages app on OS X? – Kevin Chen Jan 9 '13 at 1:31
    
I edited this to have one question. Feel free to ask the second question as a new stand-alone query. – bmike Sep 19 '13 at 0:49

Why not try CUMeeting video conferencing software which allows multiple people in the same conference.

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