"...the website loads in a special browser built into the app, rather than your phone’s default browser. In 2022, privacy researcher Felix Krause found that Meta injects special “keylogging” JavaScript onto the website you’re visiting that allows the company to monitor everything you type and tap on, including passwords. Other apps including TikTok do the same thing..." https://gizmodo.com/meet-link-history-facebook-s-new-way-to-track-the-we-1851134018

"Meta and TikTok confirmed that the code exists but said they don’t use it to snoop." https://www.washingtonpost.com/technology/2022/09/13/facebook-instagram-data-privacy/