https://arstechnica.com/information-technology/2022/08/meta-is-ever-so-slowly-expanding-its-testing-of-end-to-end-encryption/

Meta is ever so slowly expanding its trial of end-to-end encryption in a bid to protect users from snoops and law enforcement.

End-to-end encryption, often abbreviated as E2EE, uses strong cryptography to encrypt messages with a key that is unique to each user. Because the key is in the sole possession of each user, E2EE prevents everyone else—including the app maker, ISP or carrier, and three-letter agencies—from reading a message. Meta first rolled out E2EE in 2016 in its WhatsApp and Messenger apps, with the former providing it by default and the latter offering it as an opt-in feature. The company said it expects to make E2EE the default setting in Messenger by sometime next year. The Instagram messenger, meanwhile, doesn’t offer E2EE at all.