Life without Internet is definitely very troublesome and inconvenient. The invention of Internet is just like the discovery of nuclear energy -it is the result of the rapid development of science and technology—it can be good or bad thing for human beings, depending on how we use it.
Characteristics of Internet addicts.
Characteristics Typical Behaviours
(1) Excessive use of Internet Spent more than 40 hours on line per week.
(2) Obsessive thought about the Internet Unable to refrain from thinking about the Internet.
(3) Pleasant feeling in Internet use Internet exposures are pleasurable, entertaining, interactive, and relaxed.
(4) Tolerance The need to use the Internet with increased amount of time in order to achieve satisfaction.
(5) Diminished impulse control Reduced emotional self-regulation to control one's impulses to reach a goal; unable to stop using the Internet.
(6) Withdrawal Unpleasant feeling when the Internet activity is being stopped or cut down.
(7) Impact on daily life Risking the loss of a significant relationship, educational or career opportunity because of the Internet; lying to others, and escaping from problems.
(8) Parental and Family Interactions Spent less time with family members, the tension with parents is usually high.
(9) Friendship and romantic relationships Less friends and romantic relationships.
(10) Health problems Less willing to seek medical treatment and less motivated to develop stress-relieving practices.
(11) Academic performance Usually at lower level.
(12) Lonely character Lonely people used the Internet when they felt lonely, depressed or anxious.
[source]https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3217592/#!po=39.8305