Same, I have never shared anything on facebook, it's not my close friends that I'm worried about, it's all those people who are more just acquaintances. I just don't know how they would react to making videos on Youtube.
Some of my acquaintances on Facebook have already found out about my channel, and luckily they all like it. I haven't posted a video there but I too am worried about how the rest of them would react lol.
See most of my close friends know about my channel now and all love it. I just don't want to put my videos on facebook yet as I have over 500 people on there and most are from the past now. Although, 500 extra people watching my videos/maybe subscribing if they liked it could be very helpful! One day I will!