Social disconnect is one of the problem, because of the popularity of Internet, people now only meet on social networks. More and more people are getting involved in the virtual world and drifting apart from their friends and family. Even children prefer to play online games rather than going out and mingling with other kids. This may hamper a healthy social development in children.

Internet users are often threatened by virus attacks on their systems. Virus programs are inconspicuous and may get activated if we click a seemingly harmless link.

Now a days people use internet more for entertainment not for accessing information and not for increasing their knowledge ....

As for the hackers and criminals usage of net is to steal and dupe people....