I agree with all of your points and there is also the downside risk that one of that "broad audience" is going to leave some appalling or just cringe-worthy comment about your post. And unless you check up on FB regularly that association is just hanging out there. When I used FB I found that I had to go an do "maintenance" to untag photos and delete cringe-worthy comments from people I am not even really friends with. I don't miss having FB at all.