It belongs to Ward Cunningham, basically. And yeah, I suppose you could say they were early adopters:

  [prhodes@captainchaos ~]$ whois c2.com
  [Querying whois.verisign-grs.com]
  [Redirected to whois.name.com]
  [Querying whois.name.com]
  [whois.name.com]
  Domain Name: C2.COM 
  Registrar WHOIS Server: whois.name.com 
  Registrar URL: http://www.name.com 
  Updated Date: 2013-09-30T16:21:59-06:00 
  Creation Date: 1994-10-23T04:00:00-06:00

And that website serving the page is the original wiki, WikiWikiWeb. An incredible piece of Internet history and also an incredible resource for software development mastery.

This is the first wiki ever, invented by Ward Cunnigham.