Answer: If you wouldn't say it to there face don't say it online.
Explanation: When you say something to someone in person you are most likely to not say anything rude or be overly opinionated, you might fight or argue but when online people tend to say nasty stuff. For example let's say someone looks bad, in person you would probably just ignore it but online a person would say you look bad or clean yourself up. That would make someone feel bad about themself, or they would believe you. If you ignored it online they would feel better that your not beating them up for it. The concept is to only say online what you would say in person.
We can think that the author used the dialogue instead of description to show who the characters are. Using the dialogue will allow the characters to have like their own space in the plot and in this way, they have prominence as well. Making them talk shows distinctive characteristics of them and make it easier to identify them.
