But going down a rabbit hole in the era of internet does not necessarily mean gaining a lot of knowledge. Usually it means binge learning other people's information and conclusions, while not making any relevant experience and conclusion on your own, thus not making much knowledge yourself. And then moving to the next rabbit hole, to forget most things you have learned just now.

For me, a nerd is also someone who sticks to the hole and builds their own labyrinth to some degree.