There have been some questions about the safety of the site.
Are your confessions really anonymous and hidden for the eyes of a spying government.
The only thing I can assure is that I receive every message in such a way that it's for me impossible to track the sender. 
The basic idea of the project is that all information on the web can be viewed by organizations like NSA. That's why we have to be aware of how we're using the web. It would be an illusion to think that the encrypt button on the site is a guaranty for safety. Maybe it's an idea to invite someone during the period of the show to explain a bit about the possibilities of encryption, the use of special browsers, providers etc..
For now the only thing I can say that if you have any doubts about your safety after typing your secret then don't.
I'm not asking for confessions like: "I'm a terrorist". Simply if you think about what happened in the past just being a Christian, Jew, Templar, Cathar or being Gay, Bisexual, Capitalist or Communist, makes it clear that even a simple confession that's in no way threatening under our political or religious regime, can be very threatening if there is a sudden change.