 20,000,000
User-generated tags in Flickr
 20,000
Tags added in two days by the Flickr community
to 3,150 photographs from the Library of Congress
 52,216,703,165
ATM transactions per year worldwide, each of
which produces
metadata automatically
 1,000,000
Customer transactions per hour at Walmart, feeding
databases estimated at more than 2.5 petabytes
 180,000,000
Unique social bookmarks saved in delicious
 34
Gigabytes of data delivered to a typical person on a typical
day in the United States via computers, television, radio,
telephones, mobile devices, print materials
 90%
Documents that have no useful metadata, which costs
organizations $5,251 per worker per year in wasted time
looking for information
 Library statistics | Contents
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