1.) excessive use (often associated with a loss of sense of time);

Thank god for the little clock in the corner, (Do Apples have them? and could there be a link?) ;-)

2.) withdrawal symptoms when access is denied;

Ditto mobile phone internet

3.) increasing tolerance (including growing needs for exposure to obtain the same effects);

People on the internet have been getting MORE tolerant???

4.) negative repercussions (including social isolation).

and what others?

diagnosis was complicated because 86% of study subjects showing IA symptoms also exhibited other diagnosable mental health disorders.

Hmmm so who's the sane one on the site?

Any idiot can face a crisis - it's day to day living that wears you out.