Facebook can be addictive and time-consuming, causing people to waste hours browsing instead of completing work or homework, leading to lower grades. It can also negatively impact health by straining eyes and potentially causing carpal tunnel syndrome. Additionally, fake profiles are common on Facebook and used to harass and insult others, especially women. Poor privacy allows hackers to access accounts and criminals to collect personal information, while malware and viruses can spread through unprotected links and pages.