Endogenous drugs, exogenous drugs. Same effect on the brain, and in some cases the actual literal same substances. The difference is that endo-/exo- prefix, the former is made in your body, the latter is supplied from outside.

We have been learning how to induce certain experiences, which correspond to certain substances, for a long time; we're getting more competent at it; this includes social media A/B testing itself to be so sticky that a lot of people find it hard to put down; this is bad, so something* is being done about it.

* The risk being "something should be done; this is something, therefore it should be done"