Twitter Followers. Are you on Twitter? How many Twitter followers do you have? Jon Bruner from O'Reilly Media reported⁶ the information in Table 25. For selected percentiles, Table 25 shows the number of Twitter followers that each percentile represents. For example, the 50th percentile is 61 Twitter followers. Use Table 25 for Exercises 100–105. Twitter reports that there are 400 million active Twitter users worldwide who actually tweet (post messages).