Is this true? I know it's hard to define "founder" precisely, since some co-founders may get involved after the idea is partly baked, or may not have as much of an impact. But several of these seem to be questionable. (And Techmeme is misspelled... twice.)
http://en.wikipedia.org/wiki/Wordpress - "It was first released in May 2003 by its co-founders Matt Mullenweg and Mike Little as a (considered the official) successor to b2\cafelog." (Or if you meant Wordpress.com / Automattic, it also has multiple co-founders.)
http://etsy.com/about - "Etsy was founded by Rob Kalin, Chris Maguire, Haim Schoppik and Jared Tarbell in June, 2005."
http://en.wikipedia.org/wiki/Netflix - "Netflix was founded in 1997 in Scotts Valley, California by Marc Randolph and Reed Hastings, who previously had worked together at Pure Software, along with Mitch Lowe."
http://en.wikipedia.org/wiki/Digg - "Digg started out as an experiment in November 2004 by Kevin Rose, Owen Byrne, Ron Gorodetzky, and Jay Adelson."
http://en.wikipedia.org/wiki/PBworks - "PBworks (formerly PBwiki) is a commercial collaboration service created by David Weekly, with Ramit Sethi and Nathan Schmidt joining shortly thereafter as co-founders."
http://en.wikipedia.org/wiki/Wikipedia - "Launched in 2001 by Jimmy Wales and Larry Sanger..."