And thanks in part to a $50 million infusion in 2018 from Brian Acton, the former WhatsApp CEO and current interim Signal Foundation CEO, the once niche app is more accessible than ever. Signal’s popularity often spikes in times of strife or when alternatives seem more precarious. In May 2020, as police brutality protests swept US cities, daily Signal downloads nearly tripled from their average, according to analytics company Apptopia. It saw another surge in January 2021 after WhatsApp, which end-to-end encrypts personal chats using the Signal Protocol, botched the messaging around a privacy policy update. Apptopia now estimates Signal has more than 600 million active monthly users. All of those people can take advantage of end-to-end encryption, which means that no one-not the government, their phone company, or Signal itself-can read the contents of messages as they pass between devices.
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