WhatsApp users this week flocked in their millions to other more privacy-based apps like Signal and Telegram after WhatsApp announced they will soon start sharing data with Facebook.

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According to Telegram, they recorded an increase of 25 million users in the past 72 hours.

Signal’s Brian Acton said on Tuesday their new user base "exploded" this week.

Acton, who originally co-founded WhatsApp before selling it to Facebook, said Signal won’t sell its users’ data and that it won’t show its users ads.

Meanwhile, WhatsApp has now responded to the mass exodus of users and published an FAQ clarifying the terms of its updated privacy policy and responding to concerns that the firm behind the text-messaging app shares personal information with parent company Facebook.

WhatsApp noted the update doesn’t affect the privacy of messages with friends and family, and instead relates to messaging businesses through the platform.

The company also said the update "provides further transparency about how we collect and use data."

WhatsApp emphasized that neither it nor Facebook can see users’ private messages or hear their calls and that WhatsApp also doesn’t keep logs of who people message or call, can’t see your shared location (neither can Facebook), doesn’t share users’ contacts with Facebook and keeps WhatsApp groups private.

The publication of the FAQ follows calls from privacy advocates, concerned users and, notably, Elon Musk, to ditch the Facebook-owned messaging app and instead opt for encrypted messaging apps like Signal.

WhatsApp says personal messages are also protected by end-to-end encryption, but it has for years openly collected certain user data to share with Facebook.

However as experts explained, even WhatsApp has no means of accessing content in transit, while the messages on your phone are protected by the security of your device.

The issue is metadata - the who, when and where around your messages, as well as your contacts and information about your device.

WhatsApp does collect too much data, much more than the likes of Signal, Telegram and iMessage. But when compared to apps like Facebook, Messenger, Google, Instagram, Snapchat and TikTok, it collects very little.

So, unless you avoid those others, WhatsApp isn’t your biggest problem.

That being said, WhatsApp basically says the changes will mostly affect business accounts and people who chat with businesses, where the data will be used to apparently improve on the experience as well as help create more personalized ads.