While time spent online can be hugely productive, compulsive Internet use can interfere with daily life, work, and relationships. When you feel more comfortable with your online friends than your real ones, or you can’t stop yourself from playing games, gambling, or compulsively checking your smartphone, tablet, or other mobile device—even when it has negative consequences in your life—then you may be using the Internet too much.
Read the full article here: http://www.helpguide.org/articles/addiction/internet-and-computer-addiction.htm