First, face-to-face communication helps us recognize the attitude of the others towards you. Human being is so complex that one can express her emotion and attitude by using hundreds kinds of facial expression. They can show you what they feel about you by moving their eyebrow, smiling...For example, you are telling jokes at a party. You can infer this from people's faces that you are not very good at making people laugh. Therefore, you can adjust your behaviors properly before you make fun of yourself. However, if you use e-mail or instant messages, you simply see texts and it is very hard to know if the others are willing to communicate with you.