Set a posting timetable and follow a routine
People are creatures of routine. Even when you try to be spontaneous, you soon find out after a while that you have fallen back into a routine.
It's natural so you can leverage this human habits to grow your business. After setting up your Facebook business, you can run experiments to determine what works when and why.
For example, when you use Facebook ads, you can measure conversion by comments, likes and follows to determine when your ads work well and which demographic to target.
Once you have this information, you can fine tune your ads to get better conversion.
But that's not all. Content is very important and when you post them matter. When you figure out the optimum time for posting, try to post around that time and keep a regular schedule.
Once your customers know your routine you will get more out of your post and ads on Facebook.