Facebook knows you're depressed. They know before your spouse knows. Before your doctor knows. Maybe even before you fully admit it to yourself. And they are selling that information to the highest bidder. This is not a theory. It is documented, and if you are over 55, you need to understand exactly how this works. What Facebook Is Actually Tracking You've been told Facebook is a way to stay connected with family, share photos, and see what old friends are up to. Harmless fun