When chatting in Social Media or Stack Exchange chat rooms, I often see other users give some information which I already know. How should I reply?
Some people use "I know, right?" or "ikr" in internet slang. However, that sounds a bit harsh. "Thanks for letting me know" is a possibility but I think it's more for information you've just learned. Can you use it for information you already know?
What can be a substitute for "I know, right?"