This means observing etiquette in on line chat, via a chat room like facebook or wats app. It asks us to avoid ignoring messages especially that the other person knows you would have seen. To be aware of the use of emojis and to be polite to the person on the other end of the device, give a greeting before you start to converse if it's the first chat for the day .
I communicated with him on wats app and he lacked chatiquette owing to him not starting the conversation with a greeting.