There is really no book or handbook for social media post times. However, Mashable released a report based on averages which could help as a great starting point; however, the most important is to get to know your customers just like you need to know your friends and their behavior in social media channels, in order to “speak” to them at the times they are active and paying attention. You need to run several tests until finding the best time that works for your company.
Good knowledge of your customer audience is crucial, some variables to take into account are the following:
- Age groups as they have different preferred times when they check their social media platforms
- Time zones if your customers are worldwide
- Type of industry
There are also a myriad of tools that can help you get deeper insights in this area to measure the effectiveness of different posting days/times.
The Mashable report can be accessed in the following link:http://mashable.com/2012/05/09/best-time-to-post-on-facebook/