End-to-end encryption and privacy controls.
Message and call for free* around the world.
Group conversations made simple.
Say it with stickers, voice, GIFs and more.
Reach your customers from anywhere.
UC Berkeley的松鼠 https://blog.yimingchen.org/2016/11/uc-berkeley%e7%9a%84%e6%9d%be%e9%bc%a0/