After all, that type of loss can be immeasurable. “Black Twitter has reflected a fuller scope of Blackness, and a rejection of respectability,” says Sarah J. Jackson, a professor of communications on the College of Pennsylvania and coauthor of #HashtagActivism. “It has modeled what a healthy public sphere might look like, from the call-ins and callouts to the community debates about identity, from the parts that make you uncomfortable to the parts that inspire you.”