Each of the 940 tweets is associated with a Twitter user
account. In Fig. 5, we show the top 15 users that post the
most of the five engineering problems. The twitter user
names were anonymized to protect their privacy. 940 tweets
take 3.07 percent of the 30,598 tweets. As shown in Table 6,
many of the top 15 users have posted more than 3.07 percent
tweets on the five engineering problems.