Who is your target audience?
Who is it that you want to connect with?
You must be prepared to conduct some research:
See below for helpful resources to use when researching your audience.
http://www.city-data.com/
https://www.google.com/trends/
http://www.fastcompany.com/3036184/how-to-be-a-success-at-everything/the-best-and-worst-times-to-post-on-social-media-infograph
http://www.pewinternet.org/2015/01/09/social-media-update-2014/