Paula Todd goes deep into the world of "extreme mean", uncovering the people who use the internet to undermine lives rather than improve them. Through exclusive personal stories of online abuse from around the world, as well as interviews with troll-tormentors, accidental abusers, victimized kids, and adults, this book explores the roots of online abuse, challenges current academic thinking, and offers new ways of understanding the nasty and the nefarious who erode humanity and threaten internet freedom.