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"How do you know if you don't have someone's full attention during a Google Hangout? By the sound of their typing. Google, however, has decided to end the intra-company fistfights by updating its social network, enabling it to identify the apocalyptic clattering of your keyboard -- and mute your microphone for as long as it continues. Unfortunately, the company has only seen fit to add this to chats of four or more participants, so better make some more friends, stat."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2013/04/18/google-plus-hangouts-keyboard-mute/>