Imagine walking around and conversing with a friend and a salesman is hanging just behind you, listening to everything you say, and interjecting carefully craft

Imagine walking around and conversing with a friend and a salesman is hanging just behind you, listening to everything you say, and interjecting carefully crafted comments and "advice" designed to modify your buying behavior in response to what you're talking about. He's also recording your conversation and may or may not give it to the government or his advertising clients. That's this, basically. No thanks.