“All tumblr users are either too young for tumblr or too old for tumblr” - “tumblr teen” argumate (argumate is certainly not a teenager (I think he is probably like, almost 40?) but some news article referred to him as such at one point)

I wouldn’t say there’s nothing interesting on tumblr.

Like, there’s nostalgebraist’s writing on machine learning, Also other people posting some math content.

It is a social blogging site. People write blogs there.