User blog comment:Alternativus55/New Chat Record Established!/@comment-26047466-20170307191101/@comment-26031225-20170307212020

There is evidence of the record being 31.

http://thefutureofeuropes.wikia.com/wiki/Mapperdonian_Chat?diff=494997&oldid=494996

http://thefutureofeuropes.wikia.com/wiki/File:31_people_yeyeyeye-1-1.png

Now I don't think that breaking the record is an actual achievement (I was there, and half of these people were random or from other wikis), but the 37 claim has no actual evidence and it just seems to be fabricated by older users to "discredit" newbies.