I was there, and when he was on I was very wary. It wasn't until after he left when I remembered user Ralph Vargas told him to reply to his post on Mike's blog. RV was the pen name on his blog.
I checked and just saw Mike's comment back to him a minute later after he left.
I can recall my first wary response to him in the chat. Me: ...Not the real Mike Shinoda, right?
Mike's reply: That's for you to decide.
XD And I hath decided.