Wow—there is literally no way this could end badly. PetaPixel writes,
Pic Nix is a free online service that allows you to subtly and anonymously call out your friends for committing the most heinous of Instagram crimes. Created by ad agency Allen & Gerritsen, using Pic Nix is simple: just enter the name of the offender, choose from their list of 16 offenses, select one of the pre-written captions and submit your request.
[Vimeo]
Don’t like the cowardly passive aggressive anonymous nature but like the robot tech behind it / API get around.
But looks like they’ve been shut down:
http://picnix.co/game-over