No one had any idea to whom those posts and accounts belonged.

Since when is that a requirement?

There was no information in these posts that they were part of any school assignment.

Again, why should that be a requirement?

It is the first time that we have learned that you create something assignments like this.

So what? Just because you are ill-informed should make no difference.

BTW, I have informed Hivers about this in the past, such as here and here.