I know right? or IKR? 「だよね?」 <-- I didn't know this one.
August 2009 --- When did people start saying "I know, right?" in the exact same tone, everywhere?
It's got to be some kind of meme people are imitating because it's always said the same way, and never with any obvious irony.
Have I missed out on some piece of viral pop culture or is it just the new "like"?
-------- I've been saying that since long before Mean Girls. It started off as local colloquialism in the very late 20th (twentieth) century. I got money on 'Friends'.