Actually, we announced the Referly shut down in March 2013 (1) and played with several ideas after that. Based on our most popular content, we thought we would be a tech blog for about 4 weeks... code named "Cursive".

The first commit for Mattermark was made Apr 22, 2013 and we didn't buy the domain for more than a month after that.

(1) http://www.daniellemorrill.com/2013/03/zombie-startups/