On Facebook, you need to focus on your targeted potential customers. Tuesday, Wednesday, and Thursday are the best days for Facebook. Saturday and Sunday are the worse. I focus on locals. I am sending messages to locals to add me as a friend. I do not want to get in trouble with Facebook for requesting an add and that person gets upset.
I keep a list in excel who I have send messages. I do not sent double messages. I only do this on Tuesday, Wednesday and Thursday.