  Most Internet users are well aware of the virtues of search engines. As we noted earlier, many of us now depend on them to direct us to information that affects nearly all facets of our day-to-day lives—information about work, travel, recreation, entertainment, finances, politics, news, sports, music, education, and so forth. However, as we also noted earlier, the use of search engines has generated a cluster of ethical concerns. In Section 3, we organize these concerns into five broad categories: (i) search-engine bias and the problem of opacity/non-transparency, (ii) personal privacy and informed consent, (iii) monitoring and surveillance, (iv) censorship and democracy, (v) (cyber)security issues, “discoverable search engines,” and the Internet of Things. A different, but also related, cluster of ethical issues — viz, questions concerning moral accountability and social responsibilities for search engine companies — are examined in Section 4.