What are the good sides of online communication?

I think in online communiation you may use more preferences than in real communication. You may chat with someone online, but at the same time you may stop, turn it off and think if you want to think something about. If you write your thoughts, you have time to concentrate and check everything, to avoid mistakes and to show yourself in the best way. If you did something wrong, nobody will see your red cheecks if you don't want it!!! :) 
Do you agree? What do you think?