It's technically NoNaNoWriNoNoMo: "Non-National Not Writing a Novel Non-Month", a photographic response to Na(tional)No(vel)Wri(ting)Mo(nth), but is shortened to NoNoNoNo. The idea is to post 50 images in 30 days, with the emphasis on quantity, not quality.

I learned about it from Madame_Urushiol a few years ago. It's great fun, but I'm way behind this year because my camera broke toward the end of October and was in the shop until last week.