I worked on a system for querying letters from prison inmates that would allow advocates to detect and respond to abuse by guards or fellow inmates. While I do

I worked on a system for querying letters from prison inmates that would allow advocates to detect and respond to abuse by guards or fellow inmates. While I don't think I had a huge impact compared to other contributions, nor did it scale to billions of users, I like to think that it helped at raise awareness about abuses in a dark corner of the world. It is still in active use.