Due to a boring evening, I began inviting people to a chat on steam. Due to some sort of interest, I looked up information and came to the conclusion that there is NO record for most people in a single chat room. I am unsure as to why there has not been one set, I've read and re-read the rules and have found nothing that states that chat rooms are not permitted. It would be AWESOME if we could get Bff out there but if anyone else seems interested, feel free to do some research. I got an account with Guinness World Records, so don't start one up unless you want to. This website is for the gaming records
http://gamers.guinnessworldrecords.com/default.aspx
and this one is the the main GWR website.
http://www.guinnessworldrecords.com
I hope this thing works out! It's be awesome!