What is Signal? The App Hits No. 1 in Apple's App Store after Elon Musk Boost

Musk's endorsement on Twitter doesn't come out of nowhere. It follows on the news that WhatsApp — a Facebook-owned messaging app — is updating its privacy policy on February 8. That new policy will force new users to share their data with Facebook. As Apple App Store and Google Play rankings show, people followed Musk's advice. OK, so what is Signal?

What is Signal? The App Hits No. 1 in Apple's App Store after Elon Musk Boost

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