According to Wikipedia

> Addiction is ... a persistent and intense urge to use a drug or engage in a behavior that produces an immediate psychological reward, despite substantial harm and other negative consequences

Immediate psychological reward = dopamine hits from likes and shares

Harm and other negative consequences = anxiety, depression, low self-esteem, FOMO, less connection with friends and family, etc...

Food is not as easy to make addictive because the psychological reward diminishes as you get full. The exception to this is people with an eating disorder, who use eating as a way to cope with or avoid difficult feelings.