It’s ironic that the Jeff Bezos, Amazon chief executive, who heads up one of the most cyber-secure cloud architectures in the world, had his own very private data hacked and used against him. But his sloppiness about personal security provides a warning message for us all. That is, we can build the most secure, impossible-to-hack network systems, but they can’t protect us from our own stupidity—sharing very personal data over systems that aren’t so private.

Some interesting comments and suggestions come from Daniel Markuson, a digital privacy expert at NordVPN, a provider of industrial, commercial and personal cybersecurity systems, networks and products. Markuson offers some tips on protecting our privacy on line in what he calls the “five deadly sins of safety online.”