This paper studies about disadvantages of social network, especially in the present have directly effect to teenagers. This paper examines social network in health and society of people who use social network. Based on the conclusion of various research papers, it is argued that the results showed percentage of frequency, time, and type of social network that directly effect to health of people who use social network. Among other results showed, social network is social danger in the present that have an effect on oneself and others people. The paper concludes by describing about many disadvantages so is one of the warning for people who use social network too much however, it is depend on behavior of people who use social network that can choose by oneself.