A social networking service is actually an online service. There are a good number of social networking services such as Facebook, Messenger, Twitter, LinkedIn, YouTube, Instagram, Hi5, IMO, Viber, Snapchat, Skype, etc. All kinds of social network services are web-based. Nowadays, these social networks are expanding so fast because most of the social network services are rendered free of cost. A user can make the use of them free, paying a very little to the Internet service provider. He or she can make a personal profile before the entire online community. It is really like presenting oneself before the entire world. The users can also look into other people’s profile if they are interested. It is simple and easy. Besides these, social networks allow users to upload pictures, multimedia contents and modify the profile. But there are privacy protection measures too. A user himself or herself decides over the number of visitors or viewers and what information should be shared with others. So, benefits are many behind social networking services. But these social networking services are not free, from demerits. The young generation especially school-going, college-going, and university-going students are addicted to such kind of social networks. Even the various types of crimes like killing, smuggling. Fraudulence, Eve-teasing, etc. are likely to happen with the aid of social networking services. Any social movement or anti-social movement can take place with the help of these networks. So the whole world community must be aware of the bad effects of social networking services.