...and a willingness to censor within their walled garden. Maybe they had already shown that, but now I know.

I had a URL about Prop 8 (http://en.wikipedia.org/wiki/California_Proposition_8_(2008)... out from facebook chat with a message that it was possibly 'offensive' about a year ago or so .. nothing new

Some time ago I was unable to send a link via private messages to a friend, because the link was flagged as abusive/offensive. I didn't see anything wrong with the link, neither did my friend (once I got the link to him via email).

It could just be that the public friend feed only shows a small subset of all of your updates. Might have nothing to do with a blacklist.