  Search engines are some of the most popular and profitable intelligent
technologies in existence. Recent research, however, has suggested that search
engines may be surprisingly dependent on user-created content like Wikipedia
articles to address user information needs. In this paper, we perform a
rigorous audit of the extent to which Google leverages Wikipedia and other
user-generated content to respond to queries. Analyzing results for six types
of important queries (e.g. most popular, trending, expensive advertising), we
observe that Wikipedia appears in over 80% of results pages for some query
types and is by far the most prevalent individual content source across all
query types. More generally, our results provide empirical information to
inform a nascent but rapidly-growing debate surrounding a highly-consequential
question: Do users provide enough value to intelligent technologies that they
should receive more of the economic benefits from intelligent technologies?
