I suppose it depends on what you are trying to do. I don't care much. I believe most information should be as free as possible. If someone finds that I am a sincere, well informed persona - following or seeing who I follow can help them get into a loop of high signal content and ideas. I use other peoples follows to sift through this type high signal data. If I follow someone who consistently boosts someone else without adding valuable original input I would much rather just follow the former. So I find the open book useful. With regards to privacy, I don't say what I consider private online. No matter what the protocol.