To see how this works, visitors can look at that BlueKai page, which might list some categories they are interested in, or might list nothing.
Despite initial scepticism (some said "Come for a Laugh and Go Home in Stitches" would be more realistic) it seemed to work: visitors to the city rose from 700,000 in 1982 to 3m in 1990.
Work visitors influence property crime, but add little to violent crime, with statistical significance is only at the 0.05 level.
They are also the first works visitors will see.
As well as farm work, visitors can bake bread, make cheese, or process cacao into chocolate.
When the exhibition opens at the National Gallery, Four Seasonss in One Head" will be the first work visitors will see.
Later, after a video about Olmsted's life and work, visitors can linger in the small conservatory overlooking the lawn.
As they view these works, visitors will see, as many contemporaries did, that far from stagnating, Sargent was innovating in his watercolors.
"My little dream is that this can develop into an artists' community, where artists can load up their own work, visitors can browse.
To underline the target audience for Open Advertising, anyone will be able to watch video clips on the Web site but to comment, share content or upload work, visitors will need to log in through their Facebook accounts.
The first wall of work visitors will encounter is filled with abstract compositions, including what looks like a giant, delicate teardrop resting on its side and is actually a large, gracefully folded sheet of paper.
