隐私：先核对可见性，再谈高级功能
Privacy: visibility first
最后上线、头像、转发来源，这三项够新手先过一遍。
Last seen, profile photo, and forwarded-from covers are enough for a first pass.
- 在官方客户端「设置 → 隐私和安全」里改，不在第三方网页填账号。
- Change these in the official client under Settings → Privacy and Security.