It seems impossible to stop following friends, like Kongregate makes it a package deal. To stop following, I have to completely remove them from my friends, and it doesn’t seem like Kongregate lets me do one or the other individually. Only when I remove a friend, it stops following them, like so:

I want them to be my friend, yet I don’t want to see all their (non-existent) information they give me and all their (non-existent) blog posts.
Kay, thanks for helping me solve this, Kong!