CurvedSpace - http://www.cspacezone.com/
1) No longer has chat rooms, 2) Last 20 posts brings you back to 2014. 3) facebook comments left were 2015, then 2013.
1) The entire "tribe" domain has been down for 5 months according to their twitter account. Twitter <Url removed>. 2) If the main domain has been down for 5 months the subdomain is probably dead by now.