Adult social sites
It appears that adolescents and youth maintain their friendship primarily by communicating on the internet, especially young women.
Hikikomori phenomena, severe social withdrawal, is one of the most serious social concerns in Japan over the last two decades (28, 29).
Regarding hikikomori trait, the subjects at high risk for hikikomori on HQ-25 had longer internet usage time and higher scores on both IAT and SAS-SV.
Correlation analyses revealed that HQ-25 and IAT scores had a relatively strong relationship, although HQ-25 and SAS-SV had a moderately weak one.
The results of the MIAC survey (n = 38,630) reported that 59.7% of users access the internet through a smartphone, while 52.5% of them use the internet via desktop and/or laptop computers (1).
The term internet addiction has been used frequently and casually to describe individuals with severe internet overuse or problematic internet use (2–5).
In this study, we investigated the relationship of internet addiction, smartphone addiction, and the risk of hikikomori, severe social withdrawal, in Japanese young adult.
Methods: The subjects were 478 college/university students in Japan.
Results: There was a trend that males favored gaming in their internet use while females used the internet mainly for social networking via smartphone, and the mean SAS-SV score was higher in females.
Two-group comparisons between gamers and social media users, according to the main purpose of internet use, showed that gamers used the internet longer and had significantly higher mean IAT and HQ-25 scores.This phenomena of a rapid increase of smartphone users can be observed throughout the world.With more people using smartphones, problems regarding smartphone overuse become more serious.However, after thorough discussion, some regard it as one type of behavioral addiction and this attitude seems to be the majority (3, 14–16).