You must not be familiar with the "Prescriptivist vs Descriptivist" debate.

http://english.blogoverflow.com/2012/10/prescriptivism-and-d...

> Common use does not make it right.

In fact, this is the very mechanism by which language evolves.

Actually not. If you google the debate you'll find there's a history of using the word this way that goes back a very, very, long time in a variety of literature.

I have to admit I thought the same as you until someone pointed this out.

Common use is literally the only thing which defines correctness.

I find it weird that this fight is only over "literally" (which doesn't actually literally mean non-metaphorically, but rather "to do with letters") but not "really", "truly" and "actually" and other such words which do literally mean "this is true and real".

You've fallen victim to Muphry's law:

https://en.wikipedia.org/wiki/Muphry%27s_law

"litterally" only has one t in it.

> Common use does not make it right.

Yes, it does. There is no "right" in language use beyond communication with the target audience. What people understand a word to mean is all there is.