Social Media #BBUM hashtag about race relations takes off at the University of Michigan A group of students began using the hashtag #BBUM to discuss how black students are treated. The campaign soon extended well beyond that one school. By Matt WilsonNov. 22, 2013 SHARE To read the full story, log in. Become a Ragan Insider member to read this article and all other archived content. Sign up today Already a member? Log in here. Learn more about Ragan Insider.