In 1999, DoubleClick tried to create a database of user profiles that would include personal information like names and addresses.
The combined British database now holds the profiles of more than five million people.
David Evans, the editor of Online Dating Insider, an industry blog, cites the example of a hypothetical site with 15m profiles in its database.
Top Prospect sifted through 2.5 million user profiles in its database.
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So does DoubleClick, a data-mining ad "network" that monitors behavior on 1, 400 Web sites and has more than 80 million user profiles in its database.
"Once we get the sequence -- what we called the DNA profiles from the African-American that is being tested -- we compare that profile to profiles in the database, " Kittles explained.
Currently about two million people who have been charged with criminal offences have their DNA profiles on the national database.
At present, there are about six million profiles on the national DNA database, making it the biggest in the world.
There are now more than five million profiles on the national DNA database, a rise of 40% in two years.
Wanting to learn everything I could about my competition, I kept a detailed database, and I recorded which female profiles were popular.
Recent changes to the rules governing the database mean that it may eventually hold profiles from more than a fifth of all adults.
But shadow home secretary Yvette Cooper condemned changes to the DNA database, which cut the time that DNA profiles of those who are arrested but not convicted can be held, from six to three years.
The names of the people to whom the DNA profiles belong aren't stored in the database.
Interpol have already set up a prototype DNA database system which countries have only just started to add profiles to.
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If the justices rule for King, more than 1 million DNA profiles that have been stored in a federal database for matching with future crime scene evidence may have to be purged and others will never be collected, leading some repeat offenders to go free, advocates say.
So far most of the reopened cases have relied on obtaining genetic profiles which were then fed into the national DNA database to check for matches.
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When it is released, the Minnesota Population Center's database of digitized 1940 census records will allow researchers to build such profiles.
The legislation, which became law last May, is resulting in many thousands of DNA profiles being removed from the UK's giant DNA database - people arrested but not convicted of a serious offence after three years.
PayScale's database includes real-time salary data culled from 13 million unique compensation profiles.
But the police can also program the search to look for partial matches, identifying profiles that are similar but not identical to those in the database.
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The DNA database, which covers England and Wales, currently contains around 4.5m profiles - routinely taken from criminal suspects after most arrests.
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