There are a few things you can do to advertise babysitting services on Facebook. First, post a picture of your child or grandchildren with you and your babysitter. This will show people that you’re available and that your child or grandchildren are safe. Next, post a list of services that you offer. This will help people find the right babysitter for their needs. Finally, post a message asking people to come over and watch your child or grandchildren while you’re away. This will let people know that you’re available and they can come over when they need to be watched.