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Re:Scaling Erlang Developer Experience at WhatsApp [pdf] by user5994461 on Friday September 11, 2020 @03:28PM (#24446428)
WhatApps got audio and video calls after the Facebook acquisition.

Usage increased by a few orders of magnitude too.

Re:Scaling Erlang Developer Experience at WhatsApp [pdf] by stjohnswarts on Saturday September 12, 2020 @02:52AM (#24450442)
Yeah I think people get usage confused with number of users.
Re:Scaling Erlang Developer Experience at WhatsApp [pdf] by AzzieElbab on Saturday September 12, 2020 @07:29AM (#24451667)
That explains it. I haven’t used WhatsApp until few months ago