  In this paper, we analyze the nature and distribution of structured data on
the Web. Web-scale information extraction, or the problem of creating
structured tables using extraction from the entire web, is gathering lots of
research interest. We perform a study to understand and quantify the value of
Web-scale extraction, and how structured information is distributed amongst top
aggregator websites and tail sites for various interesting domains. We believe
this is the first study of its kind, and gives us new insights for information
extraction over the Web.
