In my opinion, the use of Social network there are many advantages. First, entertainment. I feel enjoy listening to music by YouTube. Second, quickly and conveniently. I communicate with friends far away conveniently and quickly.
Third, as a medium for advertising public relations such as declaration missing person.
Fourth, Link relationships. I can contact a group of friends in high school which can speak and view pictures. I don't feel far away or forget.
Final, saves money. I talk with a friend through the voice or text do not waste money like talking on the phone.
In my view. Using social network is entertainment, quickly and conveniently, as a medium for advertising Public relations, link relationships and saves money.