Why do most Facebook applications require me to add the application before being able to do anything with them? I would prefer to see a trial version first, or at least some screenshots! I rarely download an application for Windows without first looking at some screenshots.

Having to add a Facebook application just to evaluate effectively puts bad data into my news feed. I didn't add "Cool app 1.0" because I plan on using it. I'm only trying it out! I'd like to see Facebook applications have a demo/trial mode. Perhaps allow me to use it with reduced functionality, or implement a "demo user".