“The recent rise of all-encompassing internet platforms promised something unprecedented and invigorating: venues that unite all manner of actors — politicians, media, lobbyists, citizens, experts, corporations — under one roof. These companies promised something that no previous vision of the public sphere could offer: real, billion-strong mass participation; a means for affinity groups to find one another and mobilize, gain visibility and influence. This felt and functioned like freedom, but it was always a commercial simulation.”