Your fans and followers prefer using social media sites during specific hours of the day. So if you share your content when users are on these social sites, your content will not just get more eyeballs, but also get more shares and traffic.
This infographic highlights the best times to post content on six of the most popular social media sites – Facebook, Twitter, Instagram, Pinterest, LinkedIn, and Google+.
Source: http://www.99signals.com/best-times-to-post-on-social-media/