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In modern society, with the indispensable role of the Internet, social networks like Facebook, Zalo, Google Plus, and so on are becoming increasingly popular. However, besides the advantages, they also have many disadvantages. Regarding the benefits, they are means of connecting people, sharing information and advertising. By making it possible to communicate regardless of distance, social networking can considerably bring people closer to one another. Moreover, it is obvious that these networks are useful for people to share what they know and collect the information they need from others. Social networks also help brands to spread their images and introduce their products to customers through social marketing. When it comes to disadvantages, social networking is probably not only time consuming but also violating humans' privacy. Because of their attraction, social networks are addictive and can make people waste a lot of time on them. Besides, as people's personal information is shared on these networks, it is accessible by everyone and can lead to violation of privacy. In conclusion, it is advisable for users to consider both pros and cons of social networks to optimally exploit them.