Experientially it is asserted that using the Internet can lead to lower attention span and make it more difficult to read in the traditional sense (that is, read a book at length without mental interruptions). It is expirienced that we have found it more difficult to concentrate and read whole books, even though we read a great deal when we were younger (that is, when we did not had access to the Internet). This assertion is based on anecdotal evidence, not controlled research.

//from wikipedia//

Researchers from the University College London have done a 5-year study on Internet habits, and have found that people using the sites exhibited “a form of skimming activity,” hopping from one source to another and rarely returning to any source they’d already visited. The 2008 report says, "It is clear that users are not reading online in the traditional sense; indeed there are signs that new forms of “reading” are emerging as users “power browse” horizontally through titles, contents pages and abstracts going for quick wins. It almost seems that they go online to avoid reading in the traditional sense."

One of the most widely debated effects of social networking has been its influence on productivity. In many schools and workplaces, Facebook and MySpace are blocked because employers believe their employees will be distracted and unfocused on the sites. It seems, at least from one study, that employers do, indeed, have reason to be concerned. A survey from Hearst Communications found that productivity levels of people that used social networking sites were 1.5% lower than those that did not. Logically, people cannot get work done when they are performing other tasks. If the employees suffer from degrading self-control, it will be even harder for them to get back to work and maintain productivity.

Interacting on the Internet mostly does not involve "physical" interactions with another person (i.e. face-to-face conversation), and therefore easily leads to a person feeling free to act differently online, as well as unrestraint in civility and minimization of authority, etc.

People who are socially anxious are more likely to use electronic communication as their only means of communication. This, in turn, makes them more likely to disclose personal information to strangers online that they normally wouldn't give out face-to-face.The phenomenon is a likely cause for the prevalence of cyberbullying, especially for children who do not understand "social networking etiquette."

Internet anonymity can lead to online disinhibition, in which people do and say things online that they normally wouldn't do or say in person. Psychology researcher John Suler differentiates between benign disinhibition in which people can grow psychologically by revealing secret emotions, fears, and wishes and showing unusual acts of kindness and generosity and toxic disinhibition, in which people use rude language, harsh criticisms, anger, hatred and threats or visit pornographic or violent sites that they wouldn't in the 'real world.'

Moral corruption is the last one in the negative effects of Internet list. Besides many useful and effective things the Internet provides, there is something that can result in moral corruption in teenagers or students, for example, black websites. For young people at these ages, their personality, as well as moral concepts, is just developing. The impropriate information absorbed can lead to the wrong mental development. Therefore, it is necessary for adults such as parents and teachers to take the control over what kind of information is available for these teenagers.

Considered as one of the most life-changing innovations, the Internet has proved its position in every field of life, from industry to education or medication. However, the increasing negative effects of Internet raise a question about the use of Internet in daily life. As you can see, most of the negative effects of Internet are actually related to its benefits. The decisive factor between the pros and cons of Internet is about balancing between the fiction and real world. To do that, it is important to understand the nature of Internet. It was created as a supportive system for our life, not a replacement. What happening on your Facebook may not true in the real life. Your best online friend you talk every day may not the same as your expectation. But things going on in your family are real. Your relationships are more important than those people you have never met on the Internet. Therefore, to stay away from the negative effects of Internet, it is important to keep yourself from getting dependent on this network. Take up some interesting habit in the real life such as reading book and you will not have time to fall a prey for it.