No Stamp Required: All Too Easy for #Bahrain Twitter Trolls

"Danielle Citron is an expert on online harassment and privacy. She's the author of Hate Crimes in Cyberspace (Harvard University Press September 2014) and a law professor at the University of Maryland.

"Women are often attacked in a sexually humiliating and sexually threatening way and men are often reduced in the abuse to sexual objects, their sexuality targeted too, by being described as gay in an attempt to humiliate them," she says. "Much of the abuse is predictable - a playbook where threats are hauntingly similar. There's a mob culture too sometimes where the attacks are like a feeding frenzy - it's all an effort to silence people.""