Tootfinder

Threads launches DMs for users aged 18 and older, without support for E2EE, and announces a "highlighter" feature to emphasize trending topics (Emma Roth/The Verge)
https://www.theverge.com/news/695743/threads-dms-direct-messaging-launch…

Threads now has DMs
Threads has finally launched the ability to send direct messages to everyone. For now, you can only DM users who follow you on Threads or mutual follows on Instagram.

Synopsis: Secure and private trend inference from encrypted semantic embeddings
Madelyne Xiao, Palak Jain, Micha Gorelick, Sarah Scheffler
https://arxiv.org/abs/2505.23880

Synopsis: Secure and private trend inference from encrypted semantic embeddings
WhatsApp and many other commonly used communication platforms guarantee end-to-end encryption (E2EE), which requires that service providers lack the cryptographic keys to read communications on their own platforms. WhatsApp's privacy-preserving design makes it difficult to study important phenomena like the spread of misinformation or political messaging, as users have a clear expectation and desire for privacy and little incentive to forfeit that privacy in the process of handing over raw data…

Just added (#)ReplacingMatrix to my profile of course this is minus the E2EE...so in a way maybe this makes it like "Discord"...although it's a slight workaround...
ie. you need to send someone a mention to an etherpad...
ie. https://etherpad.wikimedia.org/p/MastE

User Perceptions and Attitudes Toward Untraceability in Messaging Platforms
Carla F. Griggio, Boel Nelson, Zefan Sramek, Aslan Askarov
https://arxiv.org/abs/2506.11212

User Perceptions and Attitudes Toward Untraceability in Messaging Platforms
Mainstream messaging platforms offer a variety of features designed to enhance user privacy, such as disappearing messages, password-protected chats, and end-to-end encryption (E2EE), which primarily protect message contents. Beyond contents, the transmission of messages generates metadata that can reveal who communicates with whom, when and how often. In this paper, we study user perceptions of "untraceability", i.e., preventing third parties from tracing who communicates with whom, with the g…