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So Omid jan, this is your own page. I just posted a visitors message. And you can also do a private message here too, just like facebook 
and when you want to reply back to the person, all you have to do is click on their avatar, and then it will take you to their page. Then from there you can post your visitor message
and when you want to reply back to the person, all you have to do is click on their avatar, and then it will take you to their page. Then from there you can post your visitor message