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    karengrimes94's Avatar
    karengrimes94 Posts: 102, Reputation: 1
    Junior Member
    		  
    #1

    Jun 30, 2012, 03:16 AM
    Facebook Chat
    How does Facebook know that people has seen message with whom I am chatting and display "seen" message?
    Curlyben's Avatar
    Curlyben Posts: 18,514, Reputation: 1860
    BossMan
    		  
    #2

    Jun 30, 2012, 05:38 AM
    There's a flag activated when the message is read.
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