On any given day on Facebook a user may encounter in her NewsFeed a link to an article in a respected political magazine followed by a video of a cat in a silly costume, followed by a link to a new scientific study, followed by a lengthy status update someone has posted about their lunch, followed by a photo of a popular political figure overlaid with a clever and subversive caption. Vacation photos are mixed in with political rants, invitations to cultural events, birthday reminders and data-driven graphs created to undermine common political, moral or economic beliefs. Thus while a user has a tremendous amount of liberty to choose which forms of discourse to pay closer attention to, she cannot easily shield herself from at least a superficial acquaintance with the diversity of private and public concerns of her fellows. This has the potential to offer at least some measure of protection against the extreme insularity and fragmentation of discourse that is incompatible with the public sphere.