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Sign will not exchange WhatsApp, folks will use each, says a cofounder of 1 and chief of the opposite

Sign founder Brian Acton (left) and Fb's CEO Mark Zuckerberg. Fb owns WhatsApp. Phillip Faraone/Getty Pictures for WIRED, Abdulhamid Hosbas/Anadolu Company through Getty Pictures...

Sign seems to be down for some customers after a report spike in downloads

Thomas Trutschel/Getty Photos Sign seems to be down...

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