Using https://ipinfo.io/ Socket.io HTML canvas drawing Play with it Here!
Here is the link https://220.127.116.11:8082/canvas.html Use Chrome or Firefox please. Ask your friends to join in the same ip address with you. Face the labtop camera. Use mouse to draw on anywhere on the blank page, try move your head. Here is the GitHub Page https://github.com/yulicai/Live-Web/tree/master/w4-collabrativeDrawing-withFaces