Social media is a great platform to keep in touch with your friends, and it could be a useful tool professionally too, but many people end up being addicted. People tend to expect a lot from others, and they are constantly searching for validation and attention from others by expecting a bunch of comments from other users.
It explains why they end up being disappointed because they unconsciously put their happiness in the hands of others.
Social media users think that good news is only getting a lot of likes and comments on their posts. They are actually hurting themselves by thinking this way.
Some vocabulary to understand the video:
Reward - a thing given in recognition of service, effort, or achievement.
Positive social stimuli - something or someone that provides a source of happiness.
Some scientific vocabulary to understand the video:
Nucleus accumbens - the neural interface between motivation and action
Amygdala striatal - key region for emotional processing
Dopamine - it allows you to feel pleasure, satisfaction, and motivation. It is often called the "happy hormone".