I can't say which is more harmful, but social media is a hell of a lot less fun
I take LSD every two to three months, and I'm always excited to do so, even though I usually get bad trips. Weed consistently gives me at least five minutes of joy
It certainly leads to less sex. Seems a lot of vaguely-defined experts (economists/demographers/??) are very concerned we're not having enough, so more impulse-regulating drugs seem relevant.
Then again, maybe everyone being a 10 would level that out a bit?