Many mixer URLs will be wordfiltered-out
Will you include the feedback system for filtering words? I just tested it, and (assuming I had the correct URL), it showed up. I'm asking because I've left some users neutral feedback confirming their real URL (to help others avoid phishing sites).
This is called "freedom of speech" in America. Under these rules, you can add anything to the “black list”. How convenient, isn't it?
You have the freedom to express your opinion when you're in the US. That doesn't mean you get it on every privately owned server. Just like you won't get it inside anyone's house.