1
How to reserve and change your WhatsApp username
抢先认领WhatsApp用户名，新功能还没上线也能提前注册，手慢无！
WhatsApp now lets users reserve usernames ahead of the feature’s full rollout, making it possible to connect without sharing a phone number once usern…
2
Bluesky launches group chats, as company shifts focus to community features
Bluesky群聊支持最多50人，让你和好友、社群实时畅聊，社区互动更高效、更紧密。
Bluesky's latest feature is group chats, arriving amid a shift in focus on building features for smaller communities.
3
Show HN: I recreated AOL Instant Messenger in the browser
在浏览器中复刻经典AOL即时通讯工具，怀旧风格满满，可直接体验。
What's under the hood: - Real-time messaging powered by Firebase - Buddy lists, groups & online presence - Away messages with auto-reply (and the clas…