Dark Net

The digital era offers us new technologies to protect ourselves, but are these devices defending our homes or making them more vulnerable? In this episode meet a woman whose home is invaded by a Ratter, a digital stalker who gains entry through her laptop; enter a neighborhood where residents are battling over proposed camera surveillance to monitor everyone's coming and goings; and a sex offender who received the ultimate punishment for invading his victims' privacy - life under constant surveillance.

Communities are the bedrock of society - physical spaces where residents share a collective purpose and common goals. But the internet has given rise to a new kind of community where lies and hate can flourish. In this episode meet a would-be utopia in Spain where civic life is managed on Twitter; a teacher who becomes the target of a digital lynch mob; and the father of a school shooting victim who must prove to the internet that his son existed.

Humans are social beings - but what happens when the emotional bonds that bind us together are threatened by forces we cannot see or touch, or worse, replaced entirely by the network? In this episode, meet a woman who has programmed her dead friend into a chat bot so he can live on forever; a Japanese family who has adopted a childlike AI robot as a member of their tribe; and a desperate mom turning to spyware to track her teenager's every move. Season finale.