Are there any negative effects of using Facebook?

Yes. Trust me deactivate it as soon as possible because the amount of influence it has on your mental health is immense.

What I realized from my, over 10 years of using facebook:

🏴It definitely is addictive
🏴I used apps to see how much i was active there, it turns out, it was usually close to 2 hours daily, 14 hours weekly, 60 hours a month, 720 hours an year or 30 days a year.. Are you f*cking kidding me? You spend a month on social media that brings you next to nothing. Do you know what impact it will have on your life if you spend that time productively
🏴Your cravings for validation from other people increases and this is detrimental for your growth.
🏴It will pull you away from the things you loved to do in real life.

Not all social media are the same. I find facebook very negative but I do like instagram. Most of the time, i spend there is wasted looking at beautiful nature videos/pictures, memes, funny animal videos, beautiful colorful minerals etc. I can say that it has positive impact on me. Also whatsapp which i use to keep in touch with people close to me.