This document provides guidance on the best times to post on various social media platforms based on analysis of posting times and levels of engagement. It finds that most brands post during the work week, especially on Thursdays from 9am-6pm. However, posts receive the most engagement in the evenings and on weekends. Specifically, posts on Twitter get the most retweets from 10-11pm, blogs perform best when posted from 10-11pm, Instagram videos engage more from 9pm-8am while photos have consistent engagement, and Facebook posts engage most from 12-1am. The exception is email, which sees higher open rates during the work week from 2-5pm.