This is a good idea and was one of finalist entries at the One Show Young Ones competition. The competition is one of the most acclaimed advertising, interactive and design student competitions.
This entry is from Nicole Koestel and Brian Cheung and is called Fishtagram.
The idea is simple. Based on the biggest mobile social network they came up with Fishtagram. Every picture taken with this app generate a automatic tweet to the @USDA (Dept. of Agriculture) and the local congressman.
The idea was made for PETA. Nicole and Brian don’t want to use PETA’s usual shock tactics. But want an idea with a massive impact in favor of humane fishing.