YouTube is one of the most well-known and widely discussed sites of participatory media in the contemporary online environment, and it is the first genuinely mass-popular platform for user-created video. In this timely and comprehensive introduction to how YouTube is being used and why it matters, B[...]

Since its launch in 2006, Twitter has evolved from a niche service to a mass phenomenon; it has become instrumental for everyday communication as well as for political debates, crisis communication, marketing, and cultural participation. But the basic idea behind it has stayed the same: users may po[...]