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.
2015年前期にアメリカで注目されているビジネス・実用書 https://youshofanclub.com/2015/02/18/2015-spring-businessbooks/