A Canadian “white hat” hacker spoke directly to somebody in Arizona through a hacked Nest security camera, allegedly as part of an effort to warn people of the security risks of such devices. The method the hacker(s) employed to access the device were not highly sophisticated, and allegedly involved using the same password for the Nest that was used for a compromised account for another website. This instance is the latest highlighting the importance of unique passwords, two-factor authentication, and other basic security practices.
Source: Canadian Hacker Talks to Arizona Man Directly Through His Nest Security Camera