The experience of being in a crowd is visceral. We feel a sense of connection and belonging through shared experiences like watching a sporting event, speech, or performance. In online environments, though, we are often part of a crowd without feeling it. ROAR is designed to allow very large groups of distributed spectators to have meaningful conversations with strangers or friends while creating a sense of presence of thousands of other spectators. ROAR is also interested in creating opportunities for collective action among spectators and providing flexible ways to share content among very large groups. These systems combine to let you feel the roar of the crowd even if you're alone in your bedroom.