I too am afraid of coming out of the bipolar closet entirely, although a few of my closest family and friends know. I also have made some entirely insane and sometimes rash emotional decisions. I think it is the nature of the beast.

As for fb, I try to only share neutral fb posts (mostly funny things my munchkins say) but as some have said, I start posting REALLY charismatic or political stuff sometimes when manic. Once when manic, I was tempted to post some very off the wall thoughts (because my thoughts, like most of us, can get very off the wall). I had enough reason to know they could be a little odd and called my mom. She was very worried about how manic I was and assured me that the posts would be insane. Thank goodness I called her and listened! Oftentimes, when I am even extremely manic, I can be talked down from my bizarre impulses because I still have self-awareness. Once that is gone, I am very much in trouble.