The definition of literally is no longer the literal definition of literally.
Gizmodo has discovered Google's definition for literally includes this: "Used to acknowledge that something is not literally true but is used for emphasis or to express strong feeling."
But it doesn't end with Google.
Merriam-Wesbter and Cambridge dictionaries have also added the informal, non-literal definition.
You can't get mad at people for misusing "literally" any more.
They've been misusing it so long that some of the dictionaryists have added the misuse to the definition. Some. Not all, but if those heretics can literally find just one dictionary that says they're right, they have a literal leg to stand on.
I haven't felt this bad since they changed the definition of "begs the question" to include "raises the question" back in 87.