Meta has had a rollercoaster ride through end-to-end encryption, slowly adding it to platforms like Facebook and Instagram. WhatsApp switched it on in 2016, but law enforcement can request access to your metadata. As for Facebook and Messenger, between January and June 2025, over 374,000 data requests were logged by government sources with Meta, of which the company says 78 percent had data supplied. Some of these have made headlines; in the immediate aftermath of the reversal of Roe v. Wade, police used Facebook chat logs to prosecute a person seeking an abortion.
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Nature, Published online: 04 March 2026; doi:10.1038/d41586-026-00645-2，更多细节参见PDF资料