They're listening, but not to your voice or with a microphone. Facebook is listening to your data--to all of our data, all at once. They have locations, searches, clicks, messaging, photos, hashtags, and any other form of browsing patterns for everyone in your country, everyone in your neighboorhood, everyone in the same room as you. They have enough data with such advanced analysis that on occasion they can get real…
> Facebook is listening to your data--to all of our data, all at once. So is Google. What makes FB even creepier is that they don't just watch everything people do, but they manipulate people in controlled experiments to extract as much money from them as possible.
You just described A/B testing. This is a technique used by every successful company. The only thing unique about Facebook is the data.