The audience for each Fireside Chat is invited to submit questions for the program prior to broadcast.

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One of the most popular uses of YY is for karaoke, where one person will sing while others follows along and chat with each other on text chat.

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"We have to answer thousands of questions each month through chat, through telephone, through email and we have to do that as quickly as humanly possible, " Richard Reyes-Gavilan of Brooklyn Public Library told the BBC.

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