According to Internet Entrepreneur’s it is important to note some essentials on the Facebook posting page or group. This is important so as to reach as many readers and followers to your page.
To determine the popularity and what time you can get more viewers and readers, it is recommended to be using Facebook Insights, which shows when people are on Facebook by tracking the engagement on your page, to help you identify some likely times that might work best for you.
It also recommends testing posts in three- or four-hour windows to get a general sense of what time of day your audience responds best to. Do they like seeing your content early in the morning, at lunch, after work or just before they go to bed? When you get a broader understanding of what your audience likes, you can then narrow that time of day to a specific hour and get the best reach for your Facebook post.