Social Media means an online platform used to get to know more about friends, juniors, colleagues, and many other people on the web. Most people use KakaoTalk on their smartphones. On the other hand, most teens are using social media sites such as Facebook, Instagram, and Naver Band. They are essential to them to keep their relationship.

First of all, Facebook is very popular among teens. Facebook is an American social media service website, and it was established in February. 4, 2004. It is a service that web users can form a clique. Also, it is very similar to South Korea's Cyworld. Over 13 years of age based in the US, anyone can simply sign up as a member by their name, email, date of birth, and gender. So, they meet on the web to exchange various interests and information and to share various data.

Instagram is the second popular social media. Instagram means by combining instant and telegram. It is capturing and sharing the world's moments. Unlike Facebook, it is a photo, video social media. In December 2014, it rushed to 3 million members. Mike Krieger and Kevin Systrom created Instagram. The hashtag was added to make it easier for users to find photographs or friends. Also, users can upload photographs or videos, and share them with their followers or friends. They can view posts shared by other friends, leave comments, and click the heart.

Finally, the Naver band is the third popular application. It was created by Camp Mobile in August 2012. It was supported by Android and iOS. It provides bulletin board, chat, member, calendar, and photographs. Moreover, Feed Function is in the application. When the post is uploaded for good, this function provides information on the posts and recommends bands that suit the user's personal preferences by combining the user's tendency. However, side effects have also occurred with advertising and commercial bands emerging and the sale of bands with large numbers of members.

Nowadays, teenagers use social media sites such as Facebook, Instagram, and Naver Band to build their personal relationships. By spreading globalization, social media will be more developed, and our lives will be better than before.