The next session at the 2026 International Communication Association conference in Cape Town starts with Rongxin Ouyang, who will introduce us to a new social media measure called Bartik instrument. We have for many years discussed the bidirectional relationship between audience engagement and news production: news media set agendas for audiences, but news engagement by audiences also affects how news media select which topics they cover. The causal nature, direction, and strength of this relationship remains unresolved.
This study explores this relationship for Facebook and Twitter: it gathered data from CrowdTangle (2.2m posts) and the Twitter Academic API (4.5m posts) …












