PayPal has about 123 million globally active accounts which we expect to increase to 275 million by 2019.

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Between 1996 and 2009, for example, 866 million pounds less of pesticide active ingredients were sprayed on crops globally.

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"I would say that you have a very active, if not the most active, anti-vaccination lobby globally in the U.S., " said Robb Butler with the WHO.

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"We continue to have really high penetration rates among that age group, both in the U.S. and globally, and ... younger users remain among the most active and engaged users, " Ebersman said.

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