Facebook has admitted tweaking the content of posts in an experiment to see if certain kinds of wording can manipulate readers’ moods—perhaps with the ultimate purpose of giving the sponsors of paid “advertorials” a new tool to manipulate the minds of consumers. Criticism of this “scientific experiment” has been wide-spread but not universal. After all, it is not so bad—is it? —as if Mark Zuckerberg, in an update of a nebbishy anti-hero played by Woody Allen in the 1960s, was brainwashing pretty women into dating him in preference to Brad Pitt! Even so, it does suggest that a twenty-first century bill of human rights should include an amendment outlawing making people into consumer guinea pigs in the manner predicted by Vance Packer in “The Hidden Persuaders” (1959)