Before revision:  We investigate how agents who never change their minds ("stubborn") can influence the opinion of a social group and foster the formation of polarised communities. We study the voter model in which users are divided in two camps and repeatedly update their opinions based on others they connect with.
After revision:  We investigate how agents who never change their minds ("stubborn") can influence the opinion of a social group . This is done by means of the voter model in which users are divided in two camps and repeatedly update their opinions based on others they connect with.