Welcome to TCE, FlaGal!
Actually, Travel Chums didn't merge with Meetup.com. Long story short-- the owners gave up the site due to a pending lawsuit from some patent trolls, and their web developer and I eventually agreed to give the members a discounted membership to this site. (This was before TCE began offering a free Bronze membership.
The original welcome page can still be seen here: http://www.travelcompanionexchange.com/tce/squeeze/travelchums/