WhatsApp today announced it has passed the 500 million active user milestone, up 100 million from December 2013. The company also revealed its users are now sharing more than 700 million photos and 100 million videos daily. WhatsApp CEO Jan Koum says his service has grown fastest over the last few months in countries like Brazil, India, Mexico, and Russia. In other words, emerging markets and countries with large populations are helping the messaging platform expand quickly. “We could go on, but for now, it’s more important that we get back to work – because here at WhatsApp, we’re just…

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