5 Major Disadvantages of SNS Usage: Health, Privacy, and Social Impacts from Scientific Evidence

Overview

SNS (Social Networking Service) has become an essential communication tool in modern society, but its usage has multiple scientifically demonstrated disadvantages. Based on the latest peer-reviewed academic papers and data from public research institutions published from 2024 to 2025, this article explains in detail with evidence the five major disadvantages of SNS usage—impact on mental health, addiction mechanisms, privacy risks, decline in face-to-face communication, and negative effects on sleep.

1. Negative Impact on Mental Health

Correlation with Depression and Anxiety Symptoms

A large-scale systematic review published in December 2024 clearly demonstrated the relationship between SNS usage and mental health.

Research by Ahmed et al. (2024), which integrated 182 studies (total 1,169,396 participants), confirmed a small but statistically significant positive correlation between SNS usage and depressive and anxiety symptoms¹. In particular, “Problematic Social Media Use” showed positive correlation with depression, anxiety, and sleep disorders, and negative correlation with overall well-being (happiness).

Mechanism of Increased Loneliness

A 21-day follow-up study of 418 young Japanese adults published by RIKEN in December 2024 showed that one-to-many online communication (such as SNS browsing) significantly increases loneliness (β=0.026, p<0.05)².

Interestingly, the same study revealed that while one-to-one online communication (such as direct messages) increases happiness (β=0.040, p<0.001), face-to-face communication has more than 5 times the happiness-improving effect compared to online communication.

Worsening Situation in Japan

According to a survey by the Ministry of Health, Labour and Welfare, the number of internet-addicted junior high and high school students in Japan has reached 930,000, significantly increasing from 510,000 in 2012. This represents a serious figure of 12-16% of the relevant age group³.

2. Neurobiological Addiction Mechanism

Changes in Dopamine Circuits

The mechanism by which SNS usage causes addiction is being elucidated neuroscientifically.

According to Tereshchenko’s (2023) narrative review, internet addiction (including SNS addiction) involves characteristic neurobiological changes where dopamine secretion increases in the striatum while dopamine receptor availability decreases⁴.

This is a mechanism similar to drug addiction, and the following brain changes have been confirmed:

• Decreased gray matter density in the prefrontal cortex and orbitofrontal cortex
• Imbalance in frontostriatal circuits between reward-oriented limbic system structures and prefrontal cortex control functions
• Decreased decision-making ability and difficulty in emotional regulation

Reinforcement Through Uncertain Rewards

SNS design incorporates mechanisms where rewards arrive irregularly, promoting continued user engagement⁵. The unpredictable timing of “likes” and notifications reinforces users’ behavior of repeatedly checking SNS. This mechanism is psychologically known as intermittent reinforcement and creates strong addiction.

3. Privacy and Security Risks

Data Collection and Sale to Third Parties

SNS platforms collect, analyze, and monetize user behavioral data on a large scale. According to 2024 research, online activities such as viewed webpages and purchase history are tracked through tracking cookies, and this information is sold by data brokers for marketing purposes⁶.

Decline in Public Trust

A 2023 Pew Research Center survey found that 77% of Americans have little or no trust in SNS company leaders to publicly admit responsibility for data misuse⁷. Furthermore, 71% also don’t trust these company leaders to be held accountable by the government for improper data handling.

Additionally, a SAS survey showed that privacy concerns are affecting actual user behavior⁸:

• 38% reduced their SNS usage frequency due to privacy concerns
• 36% deleted their accounts
• 31% responded they have “no confidence at all” in SNS companies’ ability to protect data

Phishing Attacks and Social Engineering

SNS has become a breeding ground for phishing attacks, where cybercriminals analyze users’ profile information in detail and launch sophisticated attacks to extract sensitive information such as passwords and credit card information⁶.

4. Decrease in Face-to-Face Communication Time

Indirect Harmful Effect Mechanism

A notable finding from RIKEN’s research is that the main harmful effect of digital use is not direct but an indirect effect through reduced face-to-face interaction time².

In other words, rather than SNS directly lowering happiness, a structure was revealed where as time spent on SNS increases, face-to-face communication decreases, and as a result, loneliness increases and happiness decreases.

Importance of Quality Communication

The same study quantitatively showed that face-to-face communication has more than 5 times the happiness-improving effect compared to one-to-one online communication. This suggests that increased SNS usage time may reduce the quality of essentially important interpersonal relationships.

5. Decline in Sleep Quality

Demonstration Through Meta-Analysis

Ahmed et al. (2024)’s meta-analysis confirmed a positive correlation between problematic SNS use and sleep disorders¹. Mechanisms by which SNS usage negatively affects sleep include:

• Suppression of melatonin secretion by blue light: Blue light emitted from smartphone and tablet screens inhibits the secretion of melatonin, the sleep hormone
• Sustained wakefulness: Emotional and cognitive stimulation from SNS content promotes brain arousal before bedtime
• Delayed bedtime: Continuing to scroll “just a little more” delays bedtime

The relationship between SNS usage and sleep is particularly important because sleep deprivation leads to further mental health deterioration, cognitive decline, and increased physical health risks.

Countermeasures and Recommendations

Evidence-Based Usage Time Limits

A 2018 study from the University of Pennsylvania showed that limiting SNS usage to 30 minutes or less per day significantly improves depressive symptoms and loneliness⁹.

Conscious SNS Usage

The following countermeasures are recommended:

1. Prioritize one-to-one communication: Emphasize bidirectional interactions like direct messages and reduce passive browsing
2. Secure time for face-to-face communication: Reduce SNS usage time and consciously increase opportunities for face-to-face interaction
3. Digital detox before bed: Don’t use smartphones 1-2 hours before bedtime
4. Review privacy settings: Regularly check privacy settings and only disclose minimum necessary information
5. Monitor usage time: Use smartphone screen time features to understand your own usage patterns

Summary

This article explained the five major disadvantages of SNS usage based on the latest peer-reviewed academic papers and public research institution data.

Key Findings Scientifically Demonstrated:

1. SNS usage has a small but significant correlation with depressive and anxiety symptoms
2. Neurobiologically causes brain changes similar to drug addiction
3. Privacy risks and cybersecurity threats are increasing
4. Indirectly reduces happiness through decreased face-to-face communication time
5. Reduces sleep quality, leading to further health risks

What’s important is that SNS itself is not uniformly harmful—usage method and time are key. While purpose-driven active use such as one-to-one communication and information gathering may have positive effects, passive browsing and excessive use amplify the above disadvantages.

Understanding evidence-based appropriate usage methods and consciously managing your own digital well-being has become an essential skill in modern society. It is expected that continued research will further elucidate the impact mechanisms of SNS usage and develop more effective countermeasures.

References

Academic Papers

Official Documents

Technical Resources and Research Reports

1. Social media use, mental health and sleep: A systematic review with meta-analyses - Ahmed O, Walsh EI, Dawel A, Alateeq K, Espinoza Oyarce DA, Cherbuin N (2024). Journal of Affective Disorders, 367, 58-80. [Reliability: High] ↩︎ ↩︎²

2. Elucidating the Impact of Social Media on Mental Health - Akaishi R, Chen Y, Zhang X (2024). npj Mental Health Research. RIKEN Press Release. [Reliability: High] ↩︎ ↩︎²

3. Internet Addiction Among Junior/Senior High Students Estimated at 930,000 - Resemom Report, Ministry of Health, Labour and Welfare Research Group Announcement (August 31, 2018). [Reliability: High] [Note: Nationwide survey results by MHLW research group (Prof. Yoneatsu Osaki, Tottori University)] ↩︎

4. Neurobiological risk factors for problematic social media use as a specific form of Internet addiction: A narrative review - Tereshchenko SY (2023). World Journal of Psychiatry, 13(5), 160-173. [Reliability: High] ↩︎

5. Addictive potential of social media, explained - Stanford Medicine (2021). [Reliability: Medium] ↩︎

6. Social Media Security: Risks, Challenges, and Solutions - Cyber Labs (2024). Technical report on privacy risks. [Reliability: Medium] [Note: Recommend verifying primary sources] ↩︎ ↩︎²

7. How Americans View Data Privacy - Pew Research Center (October 2023). [Reliability: High] ↩︎

8. 79 Eye Opening Data Privacy Statistics for 2024 - Enzuzo (2024). Privacy statistics collection including SAS survey data. [Reliability: Medium] [Note: Recommend verifying primary sources] ↩︎

9. No More FOMO: Limiting Social Media Decreases Loneliness and Depression - Hunt MG, Marx R, Lipson C, Young J (2018). Journal of Social and Clinical Psychology, 37(10), 751-768. [Reliability: High] ↩︎