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Look at a post on the time-based newsfeed services, such as Instagram, Tumblr or Twitter. Assuming people like or comment when they are using the service, you can use your friends list to calculate the number of ‘active’ users at any point. Based on their activity and the time you choose to post, you can estimate who was exposed to you work. There is a deviation based on the percentage of people who lurk without ‘liking’ and people who directly come to your site. This varies a lot, but the estimation is valuable.