The internet was hailed for democratizing ideas. But it is also an arena where conspiracy theories and polarizing echo chambers thrive. In this episode, meet an Alt-Right organizer who's using his social network to urge online sympathizers to join his real world rebellion; the desperate parents of a 17-year-old girl, brainwashed into posting White Nationalist YouTube videos; plus, an American-born former Al-Qaeda recruiter who's had a prolific effect on support for jihad.

Our face is our most distinguishable feature. But to machines, our face is data and it's being transformed into a faceprint in somebody else's database. In this episode, meet a man whose life was ruined after facial recognition technology tied him to a crime he didn't commit; a father who's wired his home with face recognition technology to keep his autistic daughter safe; plus, exclusive access to the FBI Biometric Technology Center, where over half of American's biometrics have been uploaded into a database.

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.