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If you like WhatsApp but don’t like Facebook having your meta-data, and don’t like the fact that your Google Drive back-ups are not E2E encrypted, then use Signal. WhatsApp’s encryption algorithm is based on the protocol that Signal invented, so you get the same and E2E security — but without the potential for Facebook snooping on you.

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In my case I'd also lose about 98% of my contacts, who're non-technical and don't care enough about some very abstract threats to abandon their social network or use yet another messenger app in parallel. Also, since it's not well-known here, people tend to be very suspicious of it at first, because it's not known to be super safe like Whatsapp.

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