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"Welcome to this morning's edition of \"First To Know,\" a series in which we keep you in the know on what's happening in the digital world.\nToday, we're looking at three particularly interesting stories. The mobile payments service Square introduced Square Cash, a new way to send and receive cash from your friends or acquaintances using email \u2014 no account or sign-up required. According to Raw Story, a snack company called Mondel\u0113z International Inc. is introducing \"smart shelves\" that track consumer purchases and influence impulse buys. On Tuesday, Xiaomi launched its Mi3 smartphone and smart TV. The phone sold out in 86 seconds.\nCheck out the video above for more on these stories.\nImage: Square\n"^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2013/10/16/square-cash-brief/>