Sheesh. Go read the Constitution before you start making demands with it. Also go read the FoIA.
http://www.foia.gov/. It only allows you access to information from government sources.
You can't use it to get things from private businesses. Just like the right to free speech doesn't apply in private forums. You have exactly zero right to know why you were banned, or to have it made public. If you want to publicly discuss bans again I will ban your account.