I learned how crucial moderation is for a community site like this. I originally hoped that the "good" users would overpower the trolls and create a self-sustaining community without any deliberate moderation. I was very wrong. I knew there were some people on the internet who like drawing penises and swastikas, but I totally underestimated the volume of these people.

I also learned the importance of bringing on additional help. I naively thought I could do everything myself (and I still like flying solo on the development side), but bringing on a volunteer to help moderate the site and manage the community has been incredibly helpful.