08/23/2022
Many social media platforms, including Facebook, use an in-app browser to display content and gather consumer data. For your privacy and security, when clicking a link from any social media platform that uses an in-app browser, open the link in your device's browser prior to entering any information.
https://www.forbes.com/sites/richardnieva/2022/08/18/tiktok-in-app-browser-research/
The researcher also examined in-app browsers for other apps like Instagram and Facebook Messenger, which don’t appear to track as much as TikTok.