For Mac users concerned about cybersecurity, OverSight is a free security tool designed to alert users when the microphone or webcam on their computers have been activated. As the creators of OverSight note, "[o]ne of the most insidious actions of malware" is that it can "[abuse] the audio and video capabilities of an infected host to record an unknowing user." The creators go on to say, that "while the webcam's LED will turn on whenever a session is initially started, new research has shown that malware can surreptitiously piggyback into such existing sessions [such as Facetime or Skype sessions] and record both audio and video - without fear of detection." For more information about OverSight and to download this tool, check out the link above.