I'm from Europe, I don't have FB account, but I have (and use) Instagram one.
I didn't seen any viagra, drugs or weed/CBT advertisements once.
I see many legitimate advertisements, and lot of ads of fake outdoor and motorcycle gear (to good to be true, like undestroyable sneakers and tracking boots for 10 euro, suspicious outdoor pants for 5 euros, better-to-avoid motorcycle protective gear, etc). And I'm interested in outdoor and motorcycle gear and equipment, so this ads could be named "well targeted".
Also not-so-often there are ads of AliExpress (and in last year Temu too), of course, but they are not worse than "everything under 10 euros" brick-and-mortars shops, same cheap crap (I don't say all you could buy on Ali is cheap crap, I've bought a lot of good items here, including sometimes unique things which you could not buy locally at all, but ads use very low priced crap mostly). Again, I'm using AliExpress all the time, so these ads are not completely mis-targeted too.
Never any drugs, dietary supplements, etc.
And everybody in this thread say that they experience these obviously illegal ads.