Not really, but I do get that when I've completed a challenging project. I love learning and engage in it constantly, but it's never given me a dopamine hit.
> the biggest difference between being addicted to learning vs. social media is the delay of gratification.
That may be a factor, but I really do think the largest difference is being mentally passive vs mentally active. Social media requires no effort. You let it wash over you. It's the same as television: mental candy, empty calories. Learning requires mental effort. It's like a full meal.
All that said, people vary a lot on this sort of thing and so a tool like this may be very useful to many.
No. I would imagine the biggest hit of dopamine would be literally injecting dopamine into my system.