Las Vegas Sun - Photograph : Mormon Missionaries Social Media

December 15, 2017

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In this Jan. 8, 2013, file photo, Mormon missionaries pray before the start of a class in Mandarin Chinese language at the Missionary Training Center, in Provo, Utah.  Mormon missionaries will soon spend less time knocking on doors and more time chatting online with potential converts.

Rick Bowmer / AP

In this Jan. 8, 2013, file photo, Mormon missionaries pray before the start of a class in Mandarin Chinese language at the Missionary Training Center, in Provo, Utah. Mormon missionaries will soon spend less time knocking on doors and more time chatting online with potential converts.