Fig. 4

Transitions of engagement in different topics. a Transition probabilities of topic engagement between two subsequent observations R_t and R_t+1; b Fractions of users who posted content on topic α earlier will post β later (note that \(\sum _{\beta } P(\beta |\alpha)\) is not necessarily equal to 1 as a user can post multiple different topics β after posting α); c Transition probabilities of topic engagement between the beginning R_b and the end R_e of participation