The quality of their social network and connectivity. There was a post earlier today on the the real reason for addictive behavior being the rewards mechanism in the brain. Ultimately everything on a fundamental level is brain chemistry, and brain chemistry is addictive behaviors mostly due to drugs the body produces. We follow the path of least resistance in most cases with a few exceptions where we can use long term planning to achieve a better drug hit.

For those that already established a path to stronger drugs through connectivity IRL, they are not very susceptible to such a small but regular dosage. For those with very weak connections to better drug paths, social media is like heroine. Once a path is established with momentum, even if it is terminally unsustainable, an object in motion tends to stay in motion.

Consciousness is an anomaly. We are not fully sentient in an idealized species scale philosophical sense because we can not make decisions as a species for the betterment of all and cohabitate without acting like the primal murderous predator animals we are under the masks of civility we wear in fantasy. We are still primarily just animals and subject to the law of nature; taking the path of least resistance.