I created a second Facebook account just for my daycare--it's a regular account, using my business email address and my business name instead of my real name. It's set VERY private, and the parents know this. I post updates of what we eat, what we do, pictures of the kids playing, etc. I invite families to it once they've enrolled and paid their registration fee...when a family leaves I will unfriend them. Nothing personal; the page is just for current clients.
