In ancient times, the bird plays an important part of person and person's exchange tool and people recorded their thoughts in the diary.

In the modern society, people can communication with others more easily by telephone and can exchange their ideas with others face to face.

Nowadays, with the development of social networking sites, people prefer to communicate with others on the Internet. In some public places, people have become "pubbing”. So the social networking site became my research object.

在古代，鸟类在人们沟通交流、交换信件中起到重要的作用。并且人们习惯记载他们今天发生的事情在日记上。

在近代社会，人们可以更快捷地利用电话远距离交流，以及由于交通行业的发展，人们可以轻易抵达目的地，与别人面对面地交流想法。

如今，随着社交网络的发展，人们更倾向于利用网络与不同的人在网上交流。而在一些公众场合，利于地铁、公交上，人们纷纷成为低头族。所以社交网络成为了我本次研究的对象。