Social media can hijack your time and attention. It generates rewards at unpredictable intervals to keep you scrolling, clicking and viewing for longer periods. These incentives trigger emotional reactions; you smile at feel-good pictures, laugh at funny clips, or respond to offensive, enraging or distressing stories.
Your brain responds with a chemical surge of dopamine, and like an addict, you seek another hit. Social media is designed to suck you in and keep you hooked.