The Manis site was re-dated, which an accurate radiocarbon dating of 13, 800 years ago.

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Manis says charities can insert them into text messages to provide more information to donors and potential donors.

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It is currently working with hundreds of charities that are running more than 800 campaigns in the U.S. and Canada, says Manis.

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CNN's Penny Manis, Christine Theodorou, Lonzo Cook, Richard Quest, Matthew Chance, Irene Chapple, John Defterios and Diana Magnay contributed to this report.

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Older givers appreciated the privacy afforded by mobile giving, says Manis.

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