Although total Instagram posts by brands and total interactions by audiences vary widely by day of the week, the average number of interactions per post is fairly uniform throughout the week, the analysis found.

Days on which brands tend to post less, such as Sunday and Wednesday, have a slightly higher average number of interactions per post. Friday has the lowest average number of interactions per Instagram post.

About the research: The report was based on Instagram engagement data for 100 US-focused brands in a range of different industries. The data was collected between November 15 and December 22, 2017.