Fig. 5
From: Characterizing reticulation in online social networks during disasters
The density distribution of tweeting activities per hour by active users. The y-axis is the absolute value of the tweets volume per hour. Three time periods, rising period (T1), peak period (T2), and declining period (T3), are determined by the volume of tweets with the same length of duration (3 days) in order to make the analysis more concise and intuitive