Last week I modestly attempted to show that no injustice takes place when A sells B the opportunity to pitch its product to C. This is the principle behind print, television, and radio advertising, and it is no different in the era of social networks like Facebook. In principle, the commercial act I've described is similar to many other commercial acts. Someone has a megaphone and rents it to someone else, who then uses it to convey product messages to others. Where's the objection? But this does not dispose of the matter because many people are bothered that the social networks collect...














