Really, Facebook/Google get the sweeter end of the deal. They'll know that you use Fred's arbitrary website. They will know when you use it, how often you it,

Really, Facebook/Google get the sweeter end of the deal. They'll know that you use Fred's arbitrary website. They will know when you use it, how often you it, and how long you use it each time. They'll add your new usage patterns to the database they've been building about you for the past decade. They'll correlate your behavior with other users of Fred's arbitrary website.