Fig. 4

User distribution with respect to using dominant versus other hashtags. C1 is the count of users using dominant hashtags, C2 is the count of users using non-dominant hashtags, C3 is the count of users using both dominant and non-dominant hashtags, C4 \(\leftarrow \) (C1–C3) is the count of users using dominant hashtags only (but do not use non-dominant hashtags at all), C5 \(\leftarrow \) (C2–C3) is the count of users using non-dominant hashtags only (but do not use dominant hashtags at all)