Simple definition
Dopamine is involved in motivation, reward-based learning and the search for novelty. It does not mean only "pleasure", but also "maybe the next thing will be worth it".
Why it matters on social media
Every swipe works like a bet. You don't know whether what comes next will be boring or brilliant, and that uncertainty keeps the dopaminergic system active.
What problem it creates
When the brain gets used to fast and variable stimulation, slow rewards —reading, studying, working, conversation— can feel less appealing at first.
What to do
Reduce short-form stimulation, add more friction and retrain slow rewards with how to recover attention and a 7-day digital detox.