The Zero Comment Challenge is a way for readers to find new stories and reach out to authors they want to encourage.
Every fandom has stories that get lost in the shuffle. Maybe they were posted during a busy time and didn’t get much attention. Maybe the author didn’t tag as effectively as they could have to get their story in front of the audience it was intended for. Maybe the fandom is just really shy so they leave kudos instead of comments.
The Zero Comment Challenge is meant to find those authors and give them some love. Go to the AO3 search and filter by comments, then look at the fics that don’t have any comments at all. Find one that looks interesting to you and let the author know what you thought. They get to meet a new reader and you get to find new fic. Everyone wins!
credit to @polizwrites for originating the idea and @copperbadge who wrote the first post I can find about it here.