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.
https://9lib.co/document/oz1drkdz-使用即時回饋系統輔助學習之學習投入及學習滿意度相關性因素研究.html