When Alexa is listening, what do you tell houseguests?

Earlier this week, Amazon unveiled its 50 internet-connected personal assistant "so you can add Alexa to any room in your home." Alexa is the online giant's artificial-intelligence powered bot that listens to what you say and answers your commands and questions: What's the weather? Can you order me a large pepperoni pizza? And the low priced Echo Dot, about the size of a hockey puck, means many more homes will soon have on-command digital listening devices that eavesdrop on – and store – family conversations, holiday celebrations, and even off-color comments (and also bickering siblings or quarreling spouses). Sure, it has its conveniences and Star Trek-like appeal and maybe you're OK with potential privacy implications.