A female freelance writer who blogged about the pornography industry was threatened with rape. A single mother who blogged about “the daily ins and outs of being a mom” was threatened by a cyber-stalker who claimed that she beat her son and that he had her under surveillance. Kathy Sierra, who won a large following by blogging about designing software that makes people happy, became a target of anonymous online attacks that included photos of her with a noose around her neck and a muzzle over her mouth.