Social Media The best days to post to Facebook, based on industry A new report looks at 15 business fields to determine the best day of the week to share content on Facebook for engagement. By Michael SebastianDec. 26, 2013 SHARE To read the full story, log in. Become a Ragan Insider member to read this article and all other archived content. Sign up today Already a member? Log in here. Learn more about Ragan Insider.