Chat rooms are also called channels on IRC. Here you see a small report about channel #mactel-linux on IRC network OFTC. This kind of report usually includes user statistics and topics of the last days, if the channel was registered on irc.netsplit.de and its channel mode wasn't set to private or secret by its administrators. – Channel #mactel-linux was just registered through your request. According to this there is not many data available yet, but this will change during the next hours.