My Little Pony: Friendship is Magic - Image #837,292

Oh, that gives me some more information, thanks. I also see now that the blog is a parody of Social Justice Warrior-type people, in multiple examples.

If you're asking about the comic, I think "Ask Fury Belle" is just a characteristically angry Sweetie Belle. Don't need to know much more than that for just this one comic. As for what it's talking about, check the notes on the sidebar.