This study is a first approach to improve the knowledge of the factors that influence the ED visits. In previous work, we proposed a process by which only posts that are based on specific 'important' topics are read, thus drastically reducing the amount of posts that need to be read. The process works by finding a set of 'bellwether' users that act as indicators for 'important' topics and only posts relating to these topics are then read. This approach does not consider the text of messages, only the patterns of user participation.